1. helps
2. gives
3. work
4. leave
5. go
6. shows
7. study
8. eats
9. speaks
10. plant

Explanation:

Those sentences are in simple present tense.

First-person singular: I write

Second-person singular: You write

Third-person singular: He/she/it writes (note the ‑s)

First-person plural: We write

Second-person plural: You write

Third-person plural: They write

For a few verbs, the third-person singular ends with -es instead of -s. Typically, these are verbs whose root form ends in o, ch, sh, th, ss, gh, or z.

First-person singular: I go

Second-person singular: You go

Third-person singular: He/she/it goes (note the ‑es)

First-person plural: We go

Second-person plural: You go

Third-person plural: They go

For most regular verbs, you put the negation of the verb before the verb, e.g. “She won’t go” or “I don’t smell anything.”

To make the verb to be negative, the formula is do / does + not + verb 1.

To make the sentence in interrogative, the formula do / does + subject + verb 1