плз помогите по инглишу

2. If you ask everybody for 1$ you'll collect lots of money.

3. If David speak to the teachers they will sign the petition.

4. If you don't read our leaflet carefully you shan't understand it.

5. If my sister go on the march my mom will be worried.

6. If it rains on Saturday we'll take a big umbrella.

7. If we take a fast train we shall arrive on time.