Question

Однако снова траблы с Английским, The children (to play) in the yard every day. 8 . They (not to go) to the stadium on Monday.9. She (to read) in the evening. 10. She (not to read) in the morning. 11. She (not to read) now. 12. I (to write) an essay now. 13. I (not to drink) milk now. 14. I (to go) for a walk after dinner. 15. I (not to go) to the theatre every Sunday. 16. He (not to work) now. 17. My mother (to work) in factory.

Answer 1

The children play in the yard every day. 
They do not go to the stadium on Monday.
She reads in the evening.
She does not read in the morning.
She is not reading now.
I am writing an essay now.
I am not drinking milk now.
I  go for a walk after dinner.
I do not go to the theater every Sunday.
He is not working now.
My mother works in factory.

Answer 2

The correct forms of the verbs in the sentences you provided are:

8. The children play in the yard every day.
9. They do not go to the stadium on Monday.
10. She reads in the evening.
11. She does not read in the morning.
12. I am writing an essay now.
13. I am not drinking milk now.
14. I will go for a walk after dinner.
15. I do not go to the theatre every Sunday.
16. He is not working now.
17. My mother works in a factory.

Note: The sentences you provided contain a mix of different tenses. Some use the present simple tense, some use the present continuous tense, and one uses the future tense. I have corrected the verb forms accordingly.