5) 1. Mary always helps her granny in the garden. 2. The children are playing in the yard now. 3. They'll write a dictation tomorrow. 4. My brother worked at the office last Monday. 5. I have already read this newspaper.
6) 1. Begin - began - begun. 2. Feel - felt - felt. 3. Have - had - had. 4. Leave -left - left. 5. Read - read - read. 6. Make - made - made. 7. Speak - spoke - spoken. 8. Write - wrote - written. 9. Teach - taught - taught. 10. Put - put - put.
7) 1. - a. 2 - b. 3 - a. 4 - c. 5 - c. 6 - b. 7 - b. 8 - c. 9 - b. 10 - a.