CONDITIONAL SENTENCES THEORY
  When two actions take place one after the other, it is called a conditional sentence.

• E.g. : you will succeed provided you work hard.

•  See the following words.

• 1. If 2. Provided 3. As soon as 4. No sooner than 5. Unless 6. Until 7. When

•  Conditional sentences is of three types:

• 1. If clause

• 2. Main clause

• Conditional sentences is of three types :-

• A. If clause is in present tense.

• B. If clause is in past tense.

• C. If clause is in past perfect tense.

• D. Other types of conditional

• A. ‘If clause’ is in present tense.

• General Formula :-

• In such sentences ‘if clause’ is in simple present tense and the ‘main clause’ in simple future tense.

• Eg :- if I will go to Delhi, I will see you (?)

• If I go to Delhi, I will see you. (?)

• If two actions take place one after the other in future, and if the second action depends on the first

• action, the first action is in simple present tense and the second action is in simple future tense.

• E.g. :

• 1. She will come to meet you as soon as you will reach Delhi. (wrong)

•  She will come to meet you as soon as you reach Delhi. (right)

• 2. If the government will become strict, corruption will surely finish. (wrong)

•  If the government becomes strict, corruption will surely finish. (right)

• 3. I will help him provided he will mend his ways. (wrong)

•  I will help him provided he mends his ways. (right)

• 4. Unless he will not take care of his health, he will not recover. (wrong)

•  Unless he takes care of his health, he will not recover. (right)

IF + Simple Present, Simple Future

• 5. There will be rush at the platform when the train will arrive. (?)

•  There will be rush at the platform when the train arrives. (?)

•  ‘Not’ is not used with ‘until/unless’. She sentence 4.

•  In conditional sentences, ‘will/shall’ will not be used with ‘when’ (see sentence 5)

•  Past conditional

•  If ‘If clause’ is in past tense.’

General formula :
Eg. : If I had money, I would lend it to you.
 Conditional of this type is used when we talk about something which we do not expect to happen or which is
purely imaginary.

•  In the above sentence ‘If I had money’ shows that the subject had no money.

•  “If” clause is in past perfect tense

• General formula :-

• Eg.: If I had seen you, I could have stopped my car.

• Conditional sentences of this type says that something did not happen because a certain condition was not fulfilled.

• “If” I had seen you , means “I had not seen you.”

• In such sentences we can also replace ‘If’ with ‘had’. This will not change the meaning of the sentence.

• Eg : I had seen you, I would have stopped my car.

•  Three important formula :-

•  If clause, can also take ‘unless, so long as, soon as, when, provided, in case, but for’ etc.

• E.g : Unless, you work hard, you will not pass.

• Note : “Not” is not used with unless/until.

• Unless + affirmative = If + negative

• If + Simple Past, Subject + would + V1

• If + Past Perfect, Sub + would have+ V3

• Had + Subject + V3 + Obj, Subject + would + have + V3

• If + Present Indefinite, Simple Future

• If + S + V2 , S + would + V1

• If + S + had + V3 , S + would + have + V3

•  I shall support him so long as I am alive.

•  As soon as the train comes, the platforms will get overcrowded.

•  When he comes to Delhi, I will go to met him.