1. Did you usually play marbles when you were small?

2. I usually go swimming with my friends on Sunday morning.

3. Ba Ba lake is the biggest in Viet Nam.

4. Sydney is the cleanest and the most beautiful city in the world.

5. I cannot sleep because my neighborhood is very noisy.

Thì HTĐ : S + V s / es <---> S + be + V3 ( by O )

- Thì QKĐ : S + V ed <---> S + was / were + V3 ( by O )

- Thì HTTD : S + be + V-ing <--> S + am,is,are + being + V3 ( by O )

- Thì QKTD : S + was / were + V-ing <---> S + was / were + being + V3 ( by O )

- Thì HTHT : S + have / has + V3 <---> S + have / has + been + V3 ( by O )

- Thì TLĐ : S + will + V <---> S + will be + V3 ( by O )