1 a lot of used paper were collected last month

Câu bị động: QKĐ => were/was + P.P (V3/ed)

2 a pen won’t be given to me by Minh

Câu bị động: Will + V => will be + P.P (V3/ed)

3 a birthday party will be held for me by parents next Saturday 

Câu bị động: Will + V => will be + P.P (V3/ed)

@linanguyenpham

`5.` A lot of used paper was collected last month.

Câu bị động thì quá khứ đơn: S+was/were+V3/Ved+(by O)+...

paper là danh từ không đếm được nên dùng tobe là was

`6.` A pen won't be given to me by Minh.

`7.` A birthday party will be held for me by my parents next Saturday.

Câu bị động thì tương lai đơn: S+will be+V3/Ved+(by O)+...