SUBJECT VERB AGREEMENT
In the present tense:
Singular subject - verb usually takes -s / -es
He plays
She goes
The cat runs
Plural subject - use the base form of the verb
They play
We go
The cats run
So, although -s looks like a plural ending on nouns, on present-tense verbs, -s usually indicates a singular third-person subject.
1. The boy plays football every evening.
Answer: plays
Subject = the boy (singular)
Therefore, plays is correct.
2. Sara and her sister are studying together.
Answer: are
Subject = Sara and her sister (plural)
Therefore, use are.
3. Everyone enjoys the school celebration.
Answer: enjoys
Subject = everyone (singular)
Therefore, it takes a singular verb.
4. The teacher or the principal is speaking to the parents.
Answer: is
Connected by or, use a singular verb.
5. Neither the students nor the teacher was ready.
Answer: was
Verb agrees with the subject closest to it: the teacher (singular).
6. The family lives in Abu Dhabi.
Answer: lives
Subject = family (collective noun, singular).
7. My brother and I go to school by bus.
Answer: go
Subject = my brother and I (plural).
8. The cat and the dog sleep in the garden.
Answer: sleep
Subject = the cat and the dog (plural).
9. Someone has left a notebook on the table.
Answer: has
Subject = someone (singular).
10. Either Ahmed or Ali has the key.
Answer: has
Both subjects are singular.
11. Neither the teacher nor the students are absent today.
Answer: are
Closest subject is students (plural).
12. The committee meets every Monday.
Answer: meets
Subject = committee (collective noun, singular).
13. A pen or a pencil is needed for the activity.
Answer: is
Subjects linked by or, singular verb.
14. The girls sing beautifully.
Answer: sing
Subject = the girls (plural).
15. Nobody knows the answer.
Answer: knows
Subject = nobody (singular).
16. The coach and the players work very hard.
Answer: work
Subject = the coach and the players (plural).
17. Either the students or the teacher is responsible for the project.
Answer: is
Closest subject is teacher (singular).
18. The team practises every afternoon.
Answer: practises
Subject = team (collective noun, singular).
19. The books or the notebook is on the desk.
Answer: is
Subject closest to the verb: the notebook (singular).
20. My mother and father work in the same school.
Answer: work
Subject = my mother and father (plural).