CONDITIONAL SENTENCE
THE 'ZERO' CONDITIONAL
1. Form
In 'zero' conditional sentences, the tense in both parts of the sentence is the simple present:
'IF' CLAUSE (CONDITION) | MAIN CLAUSE (RESULT) |
If + simple present If you heat ice If it rains | simple present it melts. you get wet |
NOTE: The order of the clauses is not fixed - the 'if' clause can be first or second:
- Ice melts if you heat it.
- You get wet if it rains.
2. Function
In these sentences, the time is now or always and the situation is real and possible. They are used to make statements about the real world, and often refer to general truths, such as scientific facts.
Examples:
a. If you freeze water, it becomes a solid.
b. Plants die if they don't get enough water.
c. If my husband has a cold, I usually catch it.
d. If public transport is efficient, people stop using their cars.
e. If you mix red and blue, you get purple.
This structure is often used to give instructions, using the imperative in the main clause:
- If Bill phones, tell him to meet me at the cinema.
- Ask Pete if you're not sure what to do.
'IF' SENTENCES AND THE 'UNREAL' PAST
In this section you will find information on sentences containing the word 'if', the use of conditional tenses, and the 'unreal past', that is, when we use a past tense but we are not actually referring to past time.
IF AND THE CONDITIONAL
There are four main types of 'if' sentences in English:
1. The 'zero' conditional, where the tense in both parts of the sentence is the simple present:
'IF' CLAUSE | MAIN CLAUSE |
If + simple present If you heat ice If it rains | simple present it melts. you get wet |
In these sentences, the time is now or always and the situation is real and possible. They are often used to refer to general truths.
2. The Type 1 conditional, where the tense in the 'if clause is the simple present, and the tense in the main clause is the simple future
'IF' CLAUSE | MAIN CLAUSE |
If + simple present If it rains If you don't hurry | Simple future you will get wet we will miss the train. |
In these sentences, the time is the present or future and the situation is real. They refer to a possible condition and its probable result.
3. The Type 2 conditional, where the tense in the 'if' clause is the simple past, and the tense in the main clause is the present conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + simple past If it rained If you went to bed earlier | Present conditional you would get wet you wouldn't be so tired. |
In these sentences, the time is now or any time, and the situation is unreal. They are not based on fact, and they refer to an unlikely or hypothetical condition and its probable result.
4. The Type 3 conditional, where the tense in the 'if' clause is the past perfect, and the tense in the main clause is the perfect conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + past perfect If it had rained If you had worked harder | Perfect conditional you would have got wet you would have passed the exam. |
In these sentences, the time is past, and the situation is contrary to reality. The facts they are based on are the opposite of what is expressed, and they refer to an unreal past condition and its probable past result.
A further type if 'if' sentence exists, where Type 2 and Type 3 are mixed. The tense in the 'if' clause is the past perfect, and the tense in the main clause is the present conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + past perfect If I had worked harder at school If we had looked at the map | Present conditional I would have a better job now. we wouldn't be lost. |
In these sentences, the time is past in the 'if' clause, and present in the main clause. They refer to an unreal past condition and its probable result in the present.
TYPE 1 CONDITIONAL
1. Form
In a Type 1 conditional sentence, the tense in the 'if clause is the simple present, and the tense in the main clause is the simple future
'IF' CLAUSE (CONDITION) | MAIN CLAUSE (RESULT) |
If + simple present If it rains If you don't hurry | Simple future you will get wet we will miss the train. |
2. Function
In these sentences, the time is the present or future and the situation is real. They refer to a possible condition and its probable result. They are based on facts, and they are used to make statements about the real world, and about particular situations. We often use such sentences to give warnings:
- If you don't leave, I'll call the police.
- If you don't drop the gun, I'll shoot!
Examples:
- If you drop that glass, it will break.
- Nobody will notice if you make a mistake.
- If I have time, I'll finish that letter.
- What will you do if you miss the plane?
NOTE: We can use modals to express the degree of certainty of the result:
- If you drop that glass, it might break.
- I may finish that letter if I have time.
TYPE 2 CONDITIONAL SENTENCES
1. Form
In a Type 2 conditional sentence, the tense in the 'if' clause is the simple past, and the tense in the main clause is the present conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + simple past If it rained If you went to bed earlier | Present conditional you would get wet you wouldn't be so tired. |
Present conditional, form
The present conditional of any verb is composed of two parts - the modal auxiliary would + the infinitive of the main verb (without 'to'.)
Subject | would | infinitive without to |
She | would | learn |
Affirmative | | |
I | would | go |
Negative | | |
I | wouldn't | ask |
Interrogative | | |
Would | she | come? |
Interrogative negative | | |
Wouldn't | they | accept? |
Would: Contractions of would
In spoken English, would is contracted to 'd.
I'd | We'd |
you'd | you'd |
he'd, she'd | they'd |
The negative contraction = wouldn't.
Example: to accept, Present conditional
Affirmative | Negative | Interrogative |
I would accept | I wouldn't accept | Would I accept? |
You would accept | You wouldn't accept | Would you accept? |
He would accept | She wouldn't accept | Would he accept? |
We would accept | We wouldn't accept | Would we accept? |
You would accept | You wouldn't accept | Would you accept? |
They would accept | They wouldn't accept | Would they accept? |
2. Function
In these sentences, the time is now or any time, and the situation is unreal. They are not based on fact, and they refer to an unlikely or hypothetical condition and its probable result. The use of the past tense after 'if' indicates unreality. We can nearly always add a phrase starting with "but", that expresses the real situation:
- If the weather wasn't so bad, we would go to the park (...but it is bad, so we can't go)
- If I was the Queen of England, I would give everyone £100. (...but I'm not, so I won't)
Examples of use:
1. To make a statement about something that is not real at present, but is possible:
I would visit her if I had time. (= I haven't got time but I might have some time)
2. To make a statement about a situation that is not real now and never could be real:
If I were you, I'd give up smoking (but I could never be you)
Examples:
a. If I was a plant, I would love the rain.
b. If you really loved me, you would buy me a diamond ring.
c. If I knew where she lived, I would go and see her.
d. You wouldn't need to read this if you understood English grammar.
e. Would he go to the concert if I gave him a ticket?
f. They wouldn't invite her if they didn't like her
g. We would be able to buy a larger house if we had more money
NOTE: It is correct, and very common, to say "If I were" instead of "If I was".
PRESENT CONTINUOUS CONDITIONAL
In type 2 conditional sentences, the continuous form of the present conditional may be used:
If I were a millionaire, I wouldn't be doing this job!
1. Present continuous conditional - form.
This form is composed of two elements: the present conditional of the verb 'to be' (would be) + the present participle of the main verb (base+ing).
Subject | would be | base+ing |
He They | would be would be | going living |
Affirmative |
We | would be | coming |
Negative |
You | wouldn't be | working |
Interrogative |
Would | you be | sharing? |
Interrogative negative |
Wouldn't | they be | playing? |
Example: to live, Present continuous conditional.
Affirmative | Negative | Interrogative |
I would be living | I wouldn't be living | Would I be living? |
You would be living | You wouldn't be living | Would you be living? |
He would be living | She wouldn't be living | Would he be living? |
We would be living | We wouldn't be living | Would we be living? |
You would be living | You wouldn't be living | Would you be living? |
They would be living | They wouldn't be living | Would they be living? |
2. Present continuous conditional - function
This form is common in Type 2 conditional sentences. It expresses an unfinished or continuing action or situation, which is the probable result of an unreal condition:
- I would be working in Italy if I spoke Italian.
(but I don't speak Italian, so I am not working in Italy. - She would be living with Jack if she wasn't living with her parents.
(but she is living with her parents so she's not living with Jack).
More examples:
- I wouldn't be eating this if I wasn't extremely hungry.
- If I had an exam tomorrow, I'd be revising now.
- You wouldn't be smiling if you knew the truth.
NOTE: This form is also found in: mixed conditional sentences (See section on Mixed Conditional Sentences); in indirect speech:
She said "I'll be working in the garden." She said she would be working in the garden.
TYPE 3 CONDITIONAL SENTENCES
1. Form
In a Type 3 conditional sentence, the tense in the 'if' clause is the past perfect, and the tense in the main clause is the perfect conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + past perfect If it had rained If you had worked harder | Perfect conditional you would have got wet you would have passed the exam. |
Perfect conditional - form
The perfect conditional of any verb is composed of two elements: would + the perfect infinitive of the main verb (=have + past participle):
Subject | would | perfect infinitive |
He They | would would | have gone... have stayed... |
Affirmative | | |
I | would | have believed ... |
Negative | | |
She | wouldn't | have given... |
Interrogative | | |
Would | you | have left...? |
Interrogative negative | | |
Wouldn't | he | have been...? |
Example: to go, Past conditional
Affirmative | Negative | Interrogative |
I would have gone | I wouldn't have gone | Would I have gone? |
You would have gone | You wouldn't have gone | Would you have gone? |
He would have gone | She wouldn't have gone | Would it have gone? |
We would have gone | We wouldn't have gone | Would we have gone? |
You would have gone | You wouldn't have gone | Would you have gone? |
They would have gone | They wouldn't have gone | Would they have gone? |
In these sentences, the time is past, and the situation is contrary to reality. The facts they are based on are the opposite of what is expressed.
Type 3 conditional sentences, are truly hypothetical or unreal, because it is now too late for the condition or its result to exist. There is always an unspoken "but..." phrase:
- If I had worked harder I would have passed the exam
(but I didn't work hard, and I didn't pass the exam). - If I'd known you were coming I'd have baked a cake
(but I didn't know, and I haven't baked a cake).
NOTE: Both would and had can be contracted to 'd, which can be confusing. Remember that you NEVER use would in the IF-clause, so in the example above, "If I'd known" must be "If I had known", and "I'd have baked" must be "I would have baked.."
Examples:
a. If I'd known you were in hospital, I would have visited you.
b. I would have bought you a present if I'd known it was your birthday.
c. If they'd had a better goalkeeper they wouldn't have lost the game.
d. If you had told me you were on the Internet, I'd have sent you an e-mail.
e. Would you have bought an elephant if you'd known how much they eat?
PERFECT CONDITIONAL, CONTINUOUS
1. Perfect conditional, continuous - Form
This tense is composed of two elements: the perfect condtional of the verb 'to be' (would have been) + the present participle (base+ing).
Subject | would have been | base+ing |
I We | would have been would have been | sitting swimming |
Affirmative | | |
I | would have been | studying. |
Negative | | |
You | wouldn't have been | living. |
Interrogative | | |
Would | we have been | travelling? |
Interrogative negative |
Wouldn't | it have been | working? |
Examples: to work, Past continuous conditional
Affirmative | Negative |
I would have been working | I wouldn't have been working |
You would have been working | You wouldn't have been working. |
He would have been working | She wouldn't have been working |
We would have been working | We wouldn't have been working |
You would have been working | You wouldn't have been working |
They would have been working | They wouldn't have been working |
Interrogative | Interrogative negative |
Would I have been working? | Wouldn't I have been working? |
Would you have been working? | Wouldn't you have been working? |
Would he have been working? | Wouldn't she have been working? |
Would we have been working? | Wouldn't we have been working? |
Would you have been working? | Wouldn't you have been working? |
Would they have been working? | Wouldn't they have been working? |
2. Function
This tense can be used in Type 3 conditional sentences. It refers to the unfulfilled result of the action in the if-clause, and expresses this result as an unfinished or continuous action. Again, there is always an unspoken "but.." phrase:
- If the weather had been better (but it wasn't), I'd have been sitting in the garden when he arrived (but I wasn't and so I didn't see him).
- If she hadn't got a job in London (but she did), she would have been working in Paris (but she wasn't).
Examples:
- If I'd had a ball I would have been playing football.
- If I'd had any money I'd have been drinking with my friends in the pub that night.
- If I had known it was dangerous I wouldn't have been climbing that cliff.
- She wouldn't have been wearing a seat-belt if her father hadn't told her to.
MIXED CONDITIONAL SENTENCES
It is possible for the two parts of a conditional sentence to refer to different times, and the resulting sentence is a "mixed conditional" sentence. There are two types of mixed conditional sentence:
A. Present result of past condition:
1. Form
The tense in the 'if' clause is the past perfect, and the tense in the main clause is the present conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + past perfect If I had worked harder at school If we had looked at the map | Present conditional I would have a better job now. we wouldn't be lost. |
2. Function
In these sentences, the time is past in the 'if' clause, and present in the main clause. They refer to an unreal past condition and its probable result in the present. They express a situation which is contrary to reality both in the past and in the present:
'If I had worked harder at school' is contrary to past fact - I didn't work hard at school, and 'I would have a better job now' is contrary to present fact - I haven't got a good job.
If we had looked at the map (we didn't), we wouldn't be lost (we are lost).
Examples:
- I would be a millionaire now if I had taken that job.
- If you'd caught that plane you'd be dead now.
- If you hadn't spent all your money on CDs, you wouldn't be broke.
B. Past result of present or continuing condition.
1. Form
The tense in the If-clause is the simple past, and the tense in the main clause is the perfect conditional:
'IF' CLAUSE | MAIN CLAUSE |
If + simple past If I wasn't afraid of spiders If we didn't trust him | Perfect conditional I would have picked it up. we would have sacked him months ago. |
2. Function
In these sentences the time in the If-clause is now or always, and the time in the main clause is before now. They refer to an unreal present situation and its probable (but unreal) past result:
- 'If I wasn't afraid of spiders' is contrary to present reality - I am afraid of spiders, and 'I would have picked it up' is contrary to past reality - I didn't pick it up.
- 'If we didn't trust him' is contrary to present reality - we do trust him, and 'we would have sacked him' is contrary to past reality - we haven't sacked him.
Examples:
a. If she wasn't afraid of flying she wouldn't have travelled by boat.
b. I'd have been able to translate the letter if my Italian was better.
c. If I was a good cook, I'd have invited them to lunch.
d. If the elephant wasn't in love with the mouse, she'd have trodden on him by now.