while和when引導(dǎo)的時間狀語從句主句用一般時.doc

while和when引導(dǎo)的時間狀語從句,主句用（一般過去時）從句用（過去進(jìn)行）.while引導(dǎo)的從句要加延續(xù)性動詞，而when 延續(xù)和短暫性動詞都可以，。6. 另外，when和while的區(qū)別還在于：while引導(dǎo)的時間狀語從句多用過去進(jìn)行時態(tài)，而when引導(dǎo)的時間狀語從句多用一般過去時態(tài)。While they were talking , the bell rang.正在他們談話的時候，上課鈴響了。I was doing my homework when my mother came back home yesterday evening.昨天晚上媽媽回家的時候，我正在做家庭作業(yè)。I am cooking while Jane is practicing.我在做飯的時候簡正在練習(xí)。當(dāng)此句改變主從句的位置時，則用when引導(dǎo)。When the teacher came in，we were talkingThey were sweeping the floor when the teacher came in.老師進(jìn)來時（這一時刻），他們在擦地板。While they were sweeping the floor，the teacher came in.他們正擦地板時（這段時間），老師進(jìn)來了。2. when 說明從句的動作和主句的動作可以是同時，也可以是先后發(fā)生；while 則強(qiáng)調(diào)主句的動作在從句動作的發(fā)生的過程中或主從句兩個動作同時發(fā)生。例如：They were singing while we were dancing.He fell asleep when he was reading. 他看書時睡著了。1. While we_(wait)for the bus,a girl_(run)up to us.2.I_(telephone)a friend when Bob_(come)in.6.While mother_(put)Cathy to bed,the door bell_(ring).7.when I_(walk)in the park,it_(begin) to rain.9.George_(read)when they_(hear)a knock at the door.1.I_(have)my breakfast t at half past six yesterday morning.3.What_you_(do)at that time? We_(watch)TV.6._they_(have)a meeting at 4 yesterday afternoon?No,they_.They_(clean)the classroom.13.When the bell rang,jenny_(wait )in her seat.14.She_(make)her dress the whole afternoon.1 .I _ a meal when you _ me.a. cooked, were ringing b. was cooking, rangc. was cooking, were ringing d. cooked, rang2.He said he _ to draw a plane on the blackboard at that time.a. tries b. tried c. was trying d. will try3.While she _ TV, she _ a sound outside the room.a. was watching, was hearing b. watched, was hearingc. watched, heard d. was watching, heard4.They _ a football game from 7 to 9 last night.a. were watching b. watch c. watched d. are watching 10.He _ his father on the farm the whole afternoon last Saturday.a. helps b. would help c. was helping d. is helping11.While mother _ some washing, I _ a kite for Kate.a. did, made b. was doing, made c. was doing, was making d. did, was making13.He _ some cooking at that time, so he _ mea. did, heard b. did, didnt hear c. was doing, heard d. was doing, didnt hear14.This time yesterday jack _ his bike.