Choose 3 grammatically correct sentences:

1) If I will see John, I invite him.

2) If you are cold, you should put on a warm coat.

3) If the weather is nice tomorrow, I will go to the park.

4) If my Mum lets me, I will start swimming lessons.

5) I dont go to school tomorrow if I will feel ba.

6) Liz will give me her book if she will read it.