Bài làm:
2. Tom wasn't allowed to take these books home.

→ S + was/ were ( not ) + P.P+ ( by O )

3. The exercises won't be correct by the teacher tomorrow.

→ Something + won't be + P.P + ( by O )

4.  How many tress were cut down?

→ WH - question + S + was/ were +  P.P + ( by O )

5. Many people are attracted by this well - known library.

→ S + be + P.P + ( by O )

 6. The meeting was attended by all students.

→ S + was/ were + P.P + ( by O )

7. My bike can't be repaired.

→ S + can/ should..... + ( not ) + P.P + ( by O )

`\color{green}{#Queen}`

Cth chung : $\text{S + be + P.P (by O)}$

`2.` Tom wasn't allowed to take these books home.

`-` $\text{QKĐ : S + was/were + (not) + P.P (by O)}$

`-` didn't `=>` wasn't

`3.` Exercises won't be corrected by the teacher tomorrow.

`-` $\text{TLĐ : S + will + be + P.P (by O)}$

`-` won't `=` will not

`4.` How many trees were cut down to build that fence?

`-` $\text{QKĐ : WH-question + S + was/were + P.P (by O) + ?}$

`5.` Many people are attracted by this well-known library

`-` $\text{HTĐ : S + am/is/are + P.P (by O)}$

`6.` The meeting was attended by all students.

`-` $\text{QKĐ : S + was/were + P.P (by O)}$

`7.` My bike can't be repaired.

`-` $\text{Modal verbs : S + can/may/should/... + (not) + P.P (by O)}$

`-` can't `=` cannot