1. Ken to a school club two times a week. (to go) 2. My sister German and Spanish. (to speak) 3. The group of young scientists on the project now. (to work) 4. Where is Tom? – He the dog in the park. (to walk) 5. Paul an unusual hobby for a boy. He likes cooking. (to have) 6. Are you busy? – Yes, I my mother in the kitchen. I’ll phone you later. (to help) 7. my new shoes? – Yes, they are nice. (you, to like) 8. My older brother as a manager in a shop. He leaves home at 8 a.m. (to work) 9. My grandparents are interested in theatre. They to a theatre every month. (to go) 10. Hush! They a test! Let them work. (to take) 11. He to study languages. Could you speak to him? (not to want) 12. Dear Jake, it’s always a pleasure to read your letters! It great to know about your hobbies. (to be) 13. I my homework and I can write you a letter about my hobbies. (already, to finish) 14. I like reading, too. Last month I part in school competition for young readers. (to take) 15. I the first prize. (to win) 16. I like reading fantasy stories. I a novel “The Hobbit” by J. Tolkien. (just, to finish) 17. it? (you, to read) 18. Theatre is my another hobby. I the School Theatre recently. (to join) 19. And now I want to be an actress. Yesterday my parents and I to the theatre. The performance was wonderful! (to go)

1. Ken goes to a school club two times a week.
To form a sentence in the present tense, we use the base form of the verb "to go" (go) and add an -s to it because the subject "Ken" is a third-person singular pronoun.

2. My sister speaks German and Spanish.
To form a sentence in the present tense, we use the base form of the verb "to speak" (speak) because the subject "my sister" is a third-person singular pronoun.

3. The group of young scientists is working on the project now.
To form a sentence in the present tense, we use the base form of the verb "to work" (work) because the subject "the group of young scientists" is a third-person singular noun.

4. Where is Tom? – He is walking the dog in the park.
To form a sentence in the present continuous tense, we use the verb "to be" (is) as an auxiliary verb for the present continuous tense and add the -ing form of the main verb "to walk" (walking).

5. Paul has an unusual hobby for a boy. He likes cooking.
To form a sentence in the present simple tense, we use the base form of the verb "to have" (have) and the -s form of the verb "to like" (likes) because the subject "Paul" is a third-person singular pronoun.

6. Are you busy? – Yes, I am helping my mother in the kitchen. I'll phone you later.
To form a sentence in the present continuous tense, we use the verb "to be" (am) as an auxiliary verb for the present continuous tense and add the -ing form of the main verb "to help" (helping).

7. Do you like my new shoes? – Yes, they are nice.
To form a sentence in the present simple tense, we use the base form of the verb "to like" (like) because the subject "you" is a second-person pronoun.

8. My older brother works as a manager in a shop. He leaves home at 8 a.m.
To form a sentence in the present simple tense, we use the base form of the verb "to work" (work) because the subject "my older brother" is a third-person singular pronoun.

9. My grandparents are interested in theater. They go to a theater every month.
To form a sentence in the present simple tense, we use the base form of the verb "to go" (go) because the subject "they" is a third-person plural pronoun.

10. Hush! They are taking a test! Let them work.
To form a sentence in the present continuous tense, we use the verb "to be" (are) as an auxiliary verb for the present continuous tense and add the -ing form of the main verb "to take" (taking).

11. He doesn't want to study languages. Could you speak to him?
To form a negative sentence in the present simple tense, we use the auxiliary verb "do" (doesn't) and the base form of the main verb "to want" (want) because the subject "he" is a third-person singular pronoun.

12. Dear Jake, it’s always a pleasure to read your letters! It is great to know about your hobbies.
To form a sentence in the present simple tense, we use the base form of the verb "to be" (is) because the subject "it" is a third-person singular pronoun.

13. I have already finished my homework and I can write you a letter about my hobbies.
To form a sentence in the present perfect tense, we use the auxiliary verb "have" (have) and the past participle form of the main verb "to finish" (finished).

14. I like reading, too. Last month I took part in a school competition for young readers.
To form a sentence in the past simple tense, we use the base form of the verb "to take" (took).

15. I won the first prize.
To form a sentence in the past simple tense, we use the base form of the verb "to win" (won).

16. I like reading fantasy stories. I have just finished reading a novel "The Hobbit" by J. Tolkien.
To form a sentence in the present perfect tense, we use the auxiliary verb "have" (have) and the past participle form of the main verb "to finish" (finished).

17. Have you read it?
To form a question in the present perfect tense, we invert the subject "you" and the auxiliary verb "have" (Have you).

18. Theater is another hobby of mine. I joined the School Theatre recently.
To form a sentence in the past simple tense, we use the base form of the verb "to join" (joined).

19. And now I want to be an actress. Yesterday my parents and I went to the theater. The performance was wonderful!
To form a sentence in the past simple tense, we use the base form of the verb "to go" (went).