时间状语从句课件.ppt

时间状语从句时间状语从句 When/while/before/after/until/as soon as+一个完整的句子构成一个完整的句子构成“时间状语从句时间状语从句” 注意几点：注意几点： 一、一、 when/while 的区别的区别 1.when表示主从句两个动作同时发生或表示主从句两个动作同时发生或先后先后发生。而发生。而while表示主从句两个动作同时发生表示主从句两个动作同时发生或或强调主句的动作在从句动作进行期间发生。强调主句的动作在从句动作进行期间发生。(1)_ they are waiting for the New Year, they listen to music , sing songs and dance.(2)_ the boy saw his mother, he stopped crying.WhileWhen 2. when+短暂性动词或延续性动词短暂性动词或延续性动词 while+延续性动词延续性动词 (1)He was doing his homework _ I saw him. (2)_she was singing, we all lost ourselves in her beautiful voice. (3)She was cooking _ someone knocked at the door. 3.进行时进行时+while+进行时进行时 She was dancing _ I was singingwhenWhen/whilewhenwhile 二 until “直到” notuntil直到。才。 He waited until it was 12 oclock. He didnt go home until it was 12 oclock. 三、时态 1 当主句是当主句是一般将来时或祈使句一般将来时或祈使句时，从句就用时，从句就用一一般现在时。般现在时。（与（与if条件句一样，主将从现）条件句一样，主将从现） (1)I _(tell) him when he_ (come) back tonight. (2)Please call me as soon as you _(get) there tomorrow.will tellcomesget 2.when/while主从句两个动作一长一主从句两个动作一长一短，长的动作用短，长的动作用过去进行时过去进行时，短的动，短的动作用作用一般过去时一般过去时。两个动作分不清长。两个动作分不清长短或先后，一般前后都用进行时，且短或先后，一般前后都用进行时，且用用while连接。连接。(1)When she _(get) home last night,her son _(do) his homework.(2)When the bell _(ring), he _(sleep).(3)My father was reading a book _ my mother was cooking.gotwas doingrangwas sleepingwhile 练习：用括号内动词的正确形式填空 1.My mother _(cook) dinner when I _(get) home last night. 2.I _(meet) Lingling when I _(walk) along the street. 3.Lily _(listen) to music while Lucy _(read) a story book. 4.When the teacher _(come) in, the students _(talk) 5.He _ (call) you as soon as he_(get) to Guangdong.was cookinggotmetwas walkingwas listeningwas readingcamewere talkingwill callgets