Ex7:

1. switched off - was making

2. was listening - arrived

3. were playing - said

4. met - was living

5. was drawing - was studying

6. were trying - went out

7. left - was pouring

8. saw - Was he wearing

9. was trying - stopped

10. was printing - ran out

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Hành động đang xảy ra thì có hành động khác cắt ngang

+ Hành động đang xảy ra `->` QKTD: S + was/were + Ving

+ Hành động cắt ngang `->` QKD: S + V2/ed

`-` Thì QKD:

(+) S + V2/ed

(-) S + did + not + V-inf

(?) Did + S + V-inf?

`-` Thì QKTD:

(+) S + was/were + Ving

(-) S + was/were + not + Ving

(?) Was/Were + S + Ving?