`1,` They are often laughed at by them.

S + am/is/are + P2

`2,` Our conversation was listened to very attentively by them.

S + was/were + P2

`3,` In only a week, we will be waited by them.

S + will + be + P2

`4,` All the advertisements were looked through very attentively by us.

S + was/were + P2

`5,` Everything he spoke was listened to with great attention by the audience.

S + ĐTKT + be + P2

`Melissa`

1. They often laughed at them

`->` They were often laughed by them.

2.They listened to our conversation very attentively

`->` Our converstation was listened very attentively.

3.I think they will wait for us only in a week

`->` I think we will be waited only in a week.

4.Nobody took notice of his late arrival

`->` His late arrival wasn't taken noitce.

5.We looked through all the advertisements very attentively

`->`All the advertisements  were looked throught very attentively.

6.When ever he spoke the audience listened to him with great attention.

`->`Everything he spoken was listened to with great attention by the audience.