While I (write) _____was writing_____ a letter, the telephone (ring) _______rang___; as
he (go) _____went_____ to answer it, he (hear) _____heard_____ a knock on the door;
the telephone (still, ring) ______had still rung____ while he (walk) ____was walking______ to the door, but
just as he (open) _____opened_____ it, it (stop) ___stopped_______.
đây là thì QKTD và thì QKĐ
công thức thì QKTD :
+ S + was/were + V-ing (+ O)
- S + was/were + not + V-ing (+ O)
? was/were + S + V-ing (+ O)?
công thức thì QKĐ
TOBE :
+ S + was/ were +
- S + wasn't / weren't +
? was / were + S + ...
ĐT thường
+ S + V-ed +…
- S + did not + V
? : Did + S + V