While he( write)-. a letter ,the telephone( ring)– as he(go)–. to answer it ,he(hear)–.. knock on the door.Telephone(still,rin

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1. While he( write).was writting…. a letter ,the telephone( ring)..was ringing…… as he(go)..went……. to answer it ,he(hear)….heard…… knock on the door.Telephone(still,ring)still rang……. while he( walk)….was walking….. to the door, but just as he (open) …..opened….it it (stop)…….stopped……..

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2. 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

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