Answer:
Singular-
1. My father goes gym every day.
2. She loves to play basketball.
3. She thinks he is very handsome.
4. I run every weekend.
6. Does he write an email?
15. My teacher sometimes forgets his keys.
16. I like ice-cream.
18. It smells very delicious in the kitchen.
19. Alex brushes her teeth twice a day.
20. He gets up early every day.
Plural-
5. We play tennis every morning.
7. They talk too much.
17. The students wear their uniforms.
21. They speak English in USA.
Step-by-step explanation:
Singular is when the subject is single and the verb is used in the singular form. Likewise, the plural is when the subject is multiple or more than one and the verb is in the plural form.
The given sentences are distributed according to their numbers-
Singular- These sentences have singular subjects and thus, the use of singular verbs.
1. My father goes gym every day.
2. She loves to play basketball.
3. She thinks he is very handsome.
4. I run every weekend.
6. Does he write an email?
15. My teacher sometimes forgets his keys.
16. I like ice cream.
18. It smells very delicious in the kitchen.
19. Alex brushes her teeth twice a day.
20. He gets up early every day.
Plural- The sentences have plural subjects, thus the use of the plural verbs.
5. We play tennis every morning.
7. They talk too much.
17. The students wear their uniforms.
21. They speak English in the USA.