when的用法前后的时态
when的用法前后的时态如下：
如果是宾语从句，那么时态问题就参考宾语从句的做法，如果是时间状语从句，则基本有4种。
1、表示有规律的，都用一般现在时。
如：Water turns into steam when we heat it.
2、表示将来的事情，用主将从现（主句将来时，从句一般现在时）。
如：I will i tell him when he comes back.
3、表示过去两个有先后的动作，都用过去式。
如：When he came back,I told!him the news.
4、表示一个动作正在进行（过去进行时），另一个动作插入（过去式）。
如：I met my teacher when i was walking in the street.
when
when可指时间点，又可指时间段，从句中可用延续性动词，也可用非延续性动词。when是说明从句的动作和主句的动作时可以是同时发生，也可以是先后发生。由when引导的时间状语从句，主句用过去进行时，从句应用一般过去时。
<br>回答when引导的从句，不一定指出具体的时间点。回答句中可用tomorrow和nextmonth等。而回答whattime引导的问句，则必须说出具体的时间点。由when等引导的状语从句，如果主语与主句的主语一致或是it，谓语动词又含be动词时，主语和be动词常常被省略。
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绛旓細1銆佺敱when寮曞鐨勬椂闂寸姸璇粠鍙ワ紝涓诲彞鐢ㄨ繃鍘昏繘琛屾椂锛屼粠鍙ョ敤涓鑸繃鍘绘椂銆傚锛欻e didn鈥檛 tell me when we should meet again.銆浠栨病鏈夊憡璇夋垜浠涔堟椂鍊欐垜浠兘鍐嶈闈When he was still a little boy,Jack London wrote some compositions which were praised by his teachers.鏉板厠路浼︽暒杩樻槸灏忓鏃讹紝浠栧啓...
绛旓細1.when寮曞鐨勬椂闂寸姸璇粠鍙ワ紝閬靛惊涓诲皢浠庣幇鍘熷垯 濡 I will tell you When he comes back.褰撲粬鍥炴潵鏃舵垜浼氬憡璇変綘銆2.鍓嶅悗鏃舵瑕佷竴鑷 濡 He could swim when He was two years ago.浠栦袱宀佹椂浼氭父娉炽3. 褰撲竴涓姩浣滃彂鐢燂紙涓鑸繃鍘绘椂锛夛紝鍙︿竴涓姩浣滄鍦ㄨ繘琛岋紙杩囧幓杩涜鏃舵侊級濡 The students were ...
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绛旓細when 鍚庨潰鍙互璺 涓鑸幇鍦ㄦ椂锛屼竴鑸繃鍘绘椂銆備緥濡傦細He was doing his homework when his father came back.He will write to you when he arrives in Beijing.
绛旓細3.琛ㄧず杩囧幓涓や釜鏈夊厛鍚庣殑鍔ㄤ綔锛岄兘鐢ㄨ繃鍘诲紡銆When he came back,I told him the news.浠栧洖鏉ユ椂锛屾垜鎶婃秷鎭憡璇変簡浠栥4.琛ㄧず涓涓姩浣滄鍦ㄨ繘琛岋紙杩囧幓杩涜鏃讹級锛屽彟涓涓姩浣滄彃鍏ワ紙杩囧幓寮忥級銆侷 met my teacher when i was walking in the street.鎴戝湪琛椾笂璧扮殑鏃跺欓亣鍒颁簡鎴戠殑鑰佸笀銆傚璇粠鍙鐨勬椂鎬 ...
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绛旓細when鍓嶉潰鐢ㄥ皢鏉ユ椂鎴栬呬竴鑸幇鍦ㄦ椂锛屽悗闈㈢敤涓鑸幇鍦ㄦ椂 when鍓嶇敤杩囧幓杩涜鏃讹紝鍚庨潰鐢ㄨ繃鍘绘椂 渚嬪锛欼 will be a teacher when I grow up.i was doing my homework when he came in.绁濅綘瀛︿範杩涙锛佹湜閲囩撼锛岃阿璋紒
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