Jawaban:

1. The man has worked in the factory for two years. [+]

• [-] The man hasn't worked in the factory for two years.
• [?] Has the man worked in the factory for two years?

2. The child hasn't taken a bath for ten minutes. [-]

• [+] The child has taken a bath for ten minutes.
• [?] Has the child taken a bath for ten minutes?

3. The children have played football for three hours. [+]

• [-] The children haven't played football for three hours.
• [?] Have the children played football for three hours?

4. Have the students done their duties? [?]

• [+] The students have done their duties.
• [-] The students haven't done their duties.

5. Mother has cooked in the kitchen since six o'clock. [+]

• [-] Mother hasn't cooked in the kitchen since six o'clock
• [?] Has Mother cooked in the kitchen since six o'clock?

Penjelasan:

Kalimat tersebut menggunakan Present Perfect Tense, dengan rumus umum:

[+] S + have/has + V.3 + ...

[-] S + have/has + not + V.3 + ...

[?] Has/Have + S + V.3 + ...

Semoga membantu!