4A

First conditional sentences: if (or unless) + simple present, will / won´t + base form

·         The first conditional describes future events that are likely to happen.

·         Use the present tense (NOT the future) after if in first conditional sentences.

·         First conditional = real conditions

If X happens, Y will happen e. g.,

§  If Mary comes, she’ll want to drive.

§  If you give me some money, I’ll pay you back tomorrow.

·         Unless = if … not

I won’t go unless she invites me = I won’t go if she doesn’t invite me.

·         You can also use an imperative instead of the will clause.

Come and see us next week if you have time.

Do your homework if you have some spare time.

Future time clauses

·         Use the present simple (Not the future) after when, as soon as, until, before and after to talk about the future.

·         As soon as = at the moment when, e. g.,

I'll call you as soon as I arrive.

We'll have dinner when your father gets home.

I won't go to bed until you come home.

I'll have lunch before I leave.

After I finish university, I'll probably take a year off and travel.