1. She was given a dress.

`->` Câu bị động quá khứ đơn: S + was/were + Vpp

2. David asked Lan if many tourists visited Viet Nam every year.

`->` Câu trần thuật nên lùi thì từ hiện tại đơn về quá khứ. Cấu trúc câu trần thuật yes, no: S + asked + O + if + S2 + V lùi thì

3. Do you mind lending her some many?

`->` Do you mind + Ving: Bạn có phiền khi .....

4. I have learned English for 3 years.

`->` S + started + Ving/ to V + thời gian + ago = S + have/has + Vpp + for + thời gian 

1. I gave her a dress.

=> She was given a dress by me. (Câu bị động)

2. Do many tourists visit VN every year, Lan ?

=> Davied asked Lan if many tourists visited VN every year.

3. Could you lend her some many ?

=> Do you mind lending her some money ?

(Cấu trúc : Do you mind + S + V_ing + O ?)

4. I started learning English 3 years ago.

=> I have learned English for 3 years.