[if+ clause, + clause clause + if+ clause] An if-clause can come at the beginning or end of the sentence.
If you eat too much you get fat. You get fat if you eat too much. We can use the same tenses with if as with other conjunctions.
If you want to learn a musical instrument, you have to practise. In the if-clause, we usually use a present tense to talk about the future. (This happens after most conjunctions — )
If that was Mary, why didn't she stop and say hello?
If you don't like hot weather, you'll be unhappy in Texas.
If I have enough time tomorrow, I 'II come and see you. We can use [if + .will] in polite requests, but the meaning is not really future.
(NOT If I will have enough-ttme .. .)
I'll give her your love if I see her.
(NOT . . . if I will see her. )
If you will come this way, I'll take you to the manager's office. (= If you are willing to come this way, . . .)