We use the First Conditional to talk about future events that are likely to happen.
- If we take John, he'll be really pleased.
- If you give me some money, I'll pay you back tomorrow.
- If they tell us they want it, we'll have to give it to them.
- If Mary comes, she'll want to drive.
The 'if' clause can be used with different present forms.
- If I go to New York again, I'll buy you a souvenir from the Empire State Building.
- If he's feeling better, he'll come.
- If she hasn't heard the bad news yet, I'll tell her.
The "future clause" can contain 'going to' or the future perfect as well as 'will'.
- If I see him, I'm going to tell him exactly how angry I am.
- If we don't get the contract, we'll have wasted a lot of time and money.
The "future clause" can also contain other modal verbs such as 'can' and 'must'.
- If you go to New York, you must have the cheesecake in Lindy's.
- If he comes, you can get a lift home with him.