Fill in the right form of the verbs in the brackets.

1) I will tell you if I ... (need) anything.

2) If I ... (have) her number, I would call her immediately.

3) If you ... (water) plants regularly, they grow faster.

4) If my uncle drove more slowly, I ... (join) him for a ride.

5) If he ... (study) harder, he will pass all his exams.

6) I ... (not live) in this old house if I were rich.

7) If the sun ... (go) down, it gets dark.

8) I ... (help) you if your homework is too difficult.