1. I (to read) books in the evening. 2. I (not to read) books in the morning. 3. I (to write) an exercise now. 4. I (not to write) a letter now. 5. They (to play) in the yard now. 6. They (not to play) in the street now. 7. They (to play) in the room now? 8. He (to help) his mother every day. 9. He (to help) his mother every day? 10. He (not to help) his mother every day.

Решение:

1. I am reading books in the evening. (Present Continuous, так как действие происходит сейчас, вечером.)
2. I do not read books in the morning. (Present Simple, так как это регулярное действие, которое не происходит.)
3. I am writing an exercise now. (Present Continuous, так как действие происходит прямо сейчас, 'now'.)
4. I am not writing a letter now. (Present Continuous, отрицание, действие не происходит прямо сейчас.)
5. They are playing in the yard now. (Present Continuous, действие происходит прямо сейчас, 'now'.)
6. They are not playing in the street now. (Present Continuous, отрицание, действие не происходит прямо сейчас.)
7. Are they playing in the room now? (Present Continuous, вопросительная форма, действие происходит прямо сейчас.)
8. He helps his mother every day. (Present Simple, так как это регулярное действие, которое происходит каждый день, 'every day'.)
9. Does he help his mother every day? (Present Simple, вопросительная форма, регулярное действие.)
10. He does not help his mother every day. (Present Simple, отрицание, регулярное действие не происходит.)

Ответ: am reading; do not read; am writing; am not writing; are playing; are not playing; Are...playing; helps; Does...help; does not help.