Which sentences need a past participle?

Answer 1

Perfect tenses use a past participle:

present perfect: They have traveled to Malaysia this year.

past perfect: By brother had eaten all the cake.

present perfect continuous: We have been waiting 6 hours.

past perfect continuous: Everybody had been drinking too much.

Passive sentences use a past participle:

Present simple passive: We are asked that question everyday.

Past simple passive: They were brought home eventually.

Present continuous passive: A new library is being built.

Past continuous passive: My behaviour was being discussed.

Present perfect passive: We had been invited to a dance.

Past perfect passive: Our house had been broken into.

future will, passive: The break will be baked soon.

Future going to, passive: The bread is going to be bakedsoon.

Answer 2

Sentences requiring a past participle typically involve the use of the helping verbs "have," "had," or "has." For example: "She has finished her homework," "He had been waiting for hours," or "They have already eaten dinner."