Are the sentences below correct or not? If not, correct the sentence and write it below the exercise with its number.

1  If I’m sleepy, I drink a cup of coffee.
2  If I could drive, I could get a better job.
3  We’ll go and see Max and Chris if we’ll be in Britain. 
4  If he’s from Switzerland, he probably understands French. 
5  If we left early tomorrow morning, we would arrive before 12.00. 
6  You can’t come in here unless you don’t have a ticket. 
7  If he would work harder, he passed his exam. 
8  I wouldn’t do that if I were you.  

Answer key:
1  correct = C
2 C 
3 not C/ incorrect
4 C
5 C
6 not C/ incorrect
7 not C/ incorrect
8 C

How to correct the incorrrect sentences

First - you must remember 3 types of conditional sentences 0, 1 and 2

If I get up in time, I go swimming.      0 - a general rule that's always true
   If + present tense, present tense
If I get up in time, I'll go swimming.   1 - a possible or likely future event or situation
   If + present tense, will
If I got up in time, I'd go swimming.   2 - an imaginary or unreal event or situation
   If + past tense, would

Now you can correct sentences 3, 6, 7

Answer key:
3  We'll go and see Max and Chris if we are in Britain.
6 You can't come in her unless you have a ticket. (unless = if ....not)
7 If he worked harder, he would passed his exam.