Exceptions

1. If + Present Ten	will + inf / present tense / imperative
If you help me with the dishes (if + pres), I will help you with your homework. (will + inf) If the sum of the digits of a number is divisible by three, the number is divisible by three (Pres. tense) If you see Mr Fox tonight, tell him I am ill. (imperative).
2. If + Past Tense	would + inf
3. If + Past Perfect Tense	would have + past participle
We do not normally use will or would in the conditional clause, only in the main clause.

DEFINITION:

                                                 

We use second conditional to talk and express                                                       hypothetical cases. We use it to describe imaginary                                                     situations.

If (past) .... would/could + verbOr


would/could + verb ... If (past)


Examples:1.-If I had a million dollars I would travel all around the world.
2.-If I saw Brat Pitt in the street I would faint (desmayarse)
3.-I wouldn't call him if I were you.