$\text{1. }$My handbag was left on the bus by Nga this morning.

- Chủ ngữ " handbag" số ít nên dùng tobe: was

$\text{2. }$Was she given a lot of special presents by her friends on her birthday.

- Chủ ngữ "she" số ít nên dùng tobe: was

$\text{3. }$ Last night, a lot of films were seen.

- Chủ ngữ " a lot of films" số nhiều nên dùng tobe: were

$\text{4. }$The house was built in 2000.

- Chủ ngữ "the house" số ít nên dùng tobe: was

- Cấu trúc bị động thì Quá khứ đơn: 

(+) S+ was/were+ V_ed/ bqt+ (by+O)

(-) S+ wasn't/ weren't+ V_ed/ bqt+ (by+O)

(?) Wh-question+ was/were+ S+ V_ed/ bqt+ (by+O)

- Trong đó: 

 We/ You/ They/ Danh từ số nhiều + were

                  I/He/ She/ It / Danh từ số ít+ was

$\textit{# Themoonstarhk}$

1. Nga left my handbag on the bus this morning.

-> My handbag was left on the bus this morning by Nga.

2. Did her friends give her a lot of special presents on her birthday.

-> Did she is given a lot of special presents on her birthday by her friends?

3. Last night, we saw a lot of films.

-> Last night, a lot of films were seen (by us).

mình để "by us" trong ngoặc là có thể điền thêm vào hoặc không có cũng được nhé

4. They built the house in 2000.

-> The house was built in 2000 (by them).

Các câu ở trên đều chuyển thành câu bị động hết nhé!