Select the correct passive form: "They are building a shack."

• সঠিক উত্তর: ক) A shack is being built by them.

- Active Voice:
- They are building a shack.
- Tense: Present Continuous.

- Passive Voice Structure (Present Continuous এর জন্য):
- Object + is/am/are + being + past participle (V₃) + by + subject.

- A shack (object) + is being + built (V₃ of build) + by them
-Passive Voice: A shack is being built by them.

• Other options:
খ) A shack has been built by them. : Present Perfect.
গ) A shack was built by them. : Past Indefinite.
ঘ) A shack is built by them. : Present Indefinite.

Source: A Passage to the English Language, S.M. Zakir Hussain.