Conditional sentences I

1. Use

It is possible to fulfil a condition which is given in the if-clause.

2. Form

if clause	main clause
Simple Present	will-future
	infinitive
	Modal + infinitive

3. Examples

if clause	main clause
If I study,	I will pass the exams.
If you see John tonight,	tell him to e-mail me.
If Ben gets up early,	he can catch the bus.

The if-clause can be at the beginning or at the end of a sentence.

if clause	main clause
If I study,	I will pass the exams.

main clause	if clause
I will pass the exams	if I study.