${1.}$ I was sent a present last week.

          A present was sent to me last week.

→ bị động QKĐ: S + was/were (not) +V3/ed +(by+O)

    bị động với give/send/sell/bring/allow/write ... :

+) S(người) + Vbe + v3/ed + O(vật) + (by+O) + time

+) S(vật) + vbe + v3/ed + to + O(người) + (by+O)

${2.}$ We were given more information by her.

          More information was given to us by her.

→ giải thích giống câu 1

${3.}$ All the workers of the plan were being instructed by the chief engineer.

→ bị động QKTD: S + was/were (not) + being + v3/ed +(by+O) + time

${3.}$ Tea can't be made with cold water.

→ bị động động từ khiếm khuyết: S + can/could/must/should/shall/might/may/must .. (not) + be + v3/ed +(by+O) + time

${4.}$ Some of my books have been taken away.

→ bị động HTHT: S + have/has (not) + been + v3/ed +(by+O) + time

${5.}$ The meeting will be held before May Day.

→ bị động TLĐ: S + will (not) + be + v3/ed +(by+O) + time

1,They sent me a present last week.

-> I was sent a present last week. 

2,She gave us more iìnormation

-> We were given more information by her. 

3,The chief engineer was instructing all the workers of the plan

-> All the workers were being instructed of the plan by the chief. 

3,They can't make tea with cold water

-> Tea can't be made with cold water. 

4, Somebody has taken some of my books away.

-> Some of my books have been taken away. 

5,They will hold the meeting before May Day

-> The meeting will be held before the May Day. 

Giải thích

- S + ĐTKT + be + P2

- S + have/has + been + P2

- S + was/were + being + P2

- S + was/were + P2