11选5每期必中的万能码: when while用法
when和while的用法和区别 while和when都是表示同时，到底句子中是用when还是while主要看从句和主句中所使用的动词是短暂性动作（瞬时动词）还是持续性动作。 1、若主句表示的是一个短暂性的动作，而从句表示的是一个持续性动作时，两者都可用。如： He fell asleep when [while] he was reading. 他看书时睡着了。 I met him when [while] I was taking a walk in the park. 我在公园散步时遇到了他。 2、若主、从句表示两个同时进行的持续性动作，且强调主句表示的动作延续到从句所指的整个时间，通常要用 while。如： Don’t talk while you’re eating. 吃饭时不要说话。 I kept silent while he was writing. 在他写的时候，我默不作声。 3、若从句是一个短暂性动作，而主句是一个持续性动作，可以 when 但不用 while。如： When he came in, I was listening to the radio. 他进来时，我在听收音机。 It was raining hard when we arrived. 我们到达时正下着大雨。 4、若主、从句表示的是两个同时(或几乎同时)发生的短暂性动作，一般要用 when。如： I thought of it just when you opened your mouth. 就在你要说的时候，我也想到了。 如果是进行时态，一般是持续性的。如果是过去式，一般是短暂性动作。 对于，填写when还是while的问题，通常首先看主句和从句中的时态，再根据以上4个规律来判断填写那个单词。 主句 从句 短暂性 when/while 持续性 （过去时） （过进：was/were +doing） He fell asleep when [while] he was reading. 持续性 while 持续性 （一般现在/过去时） （过进：was/were +doing） Don’t talk while you’re eating. I kept silent while he was writing. （现进：am/is/are +doing） （现进：am/is/are +doing） （过进：was/were +doing） （过进：was/were +doing） I was watching TV while My mother was cooking (动作同时发生) 持续性 when 短暂性 （过进：was/were +doing） （过去时） I was listening to the radio When he came in. 短暂性 when 短暂性 （过去时） （过去时） I thought of it just when you opened your mouth. 用when或while 填空 1________ Tom was eating supper, it began to rain outside. 2 Don t use your phone________ you are driving a car. 3 What were you doing ______ Mr. Zhou came in ? 4 Jim is good at math _____ Mary is good at English. 5 We were watching TV ___ the electricity was off 6 ________Peter was sleeping; a thief broke into his house. 7 It snowed ________ we arrived in Tokyo. 8 She left her hometown________ she was five. 9 I was studying in the library_____ the UFO landed 选用when或while填空。 1. My wallet dropped on the ground____ I was walking. 2. ________ I was falling asleep there was a loud knock on the door. 3. ________ he was reading, the telephone rang. 4. Were the students listening to the teacher carefully ________ the teacher was giving a lesson? 5. ________ the telephone rang, I was doing my homework. 6. Was she playing games ________ the bell was ringing? 7. The days get longer ________ spring comes. 8. Lucy was listening to the radio ________ Lily was watching TV. 9. ________ we were batting on the lake, we saw a fish jump out of the water. 10. They have their PE lesson indoors ________ it rains. 用when, while填空： 1. I was listening to the radio _______ he came in. 2. _______ the teacher came in, we were talking. 3. _____ he came back, I was doing some washing. 4. I was cooking dinner _______ they came home. 5. He fell asleep ____________ he was reading. 6. He asked me a question _______ I was speaking. 7. Jim hurt his arm _______ he was playing tennis. 8. ___________ she was waiting for the train, she became very impatient. 9. He was watching TV ________ she was cooking.