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1、时间状语从句注意几点,When/while/before/after/until/as soon as+一个完整的句子构成“时间状语从句” 注意几点： 一、 when/while 的区别 1.when表示主从句两个动作同时发生或先后发生。而while表示主从句两个动作同时发生或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.,While,Wh
2、en,2. when+短暂性动词或延续性动词while+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+while+进行时 She was dancing _ I was singing,when,When/while,when,while,二 until “直到”notuntil直到。才。 He wai
3、ted until it was 12 oclock. He didnt go home until it was 12 oclock. 三、时态 1 当主句是一般将来时或祈使句时，从句就用一般现在时。（与if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 tell,comes,get,2.when/while主从句两个动作一长一短，长的动作用过去进行时，短的动作用一般过去时。两个动作分不清长短或先后，一
4、般前后都用进行时，且用while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. 3.before/after主从句两个动作都已经完成了，先完成了的动作用过去的完成时（had+过去分词）。后完成的动作用一般过去时。 (1)I _(finish) my homework before my mother _(get) hom
5、e last night. (2)The last bus _(leave) after we _(get) to the bus stop.,got,was doing,rang,was sleeping,while,had finished,got,had left,got,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 cooking,got,met,was walking,was listening,was reading,came,were talking,will call,gets,
