用when引导的从句是什么时态 when引导的时间状语从句时态是啥
when\u5f15\u5bfc\u7684\u4ece\u53e5\u548c\u4e3b\u53e5\u7528\u4ec0\u4e48\u65f6\u60011.when\u5f15\u5bfc\u7684\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\uff0c\u9075\u5faa\u4e3b\u5c06\u4ece\u73b0\u539f\u5219
\u5982 I will tell you When he comes back.
\u5f53\u4ed6\u56de\u6765\u65f6\u6211\u4f1a\u544a\u8bc9\u4f60\u3002
2.\u524d\u540e\u65f6\u6001\u8981\u4e00\u81f4
\u5982
He could swim when He was two years ago.\u4ed6\u4e24\u5c81\u65f6\u4f1a\u6e38\u6cf3\u3002
3. \u5f53\u4e00\u4e2a\u52a8\u4f5c\u53d1\u751f\uff08\u4e00\u822c\u8fc7\u53bb\u65f6\uff09\uff0c\u53e6\u4e00\u4e2a\u52a8\u4f5c\u6b63\u5728\u8fdb\u884c\uff08\u8fc7\u53bb\u8fdb\u884c\u65f6\u6001\uff09
\u5982
The students were talking when the teacher came into the classroom.
\u8001\u5e08\u5c31\u8fdb\u6559\u5ba4\u7684\u65f6\u5019\uff0c\u5b66\u751f\u4eec\u6b63\u5728\u8bf4\u8bdd\u3002
Jennifer: Hello, Vicki. I haven\u2019t seen you for a long time.Vicki: Yeah, it\u2019s been so long. How have you been?Jennifer: I\u2019ve been all right. How time flies! Do you remember\uff1f
二、测试when引导的时间状语从句的省略。
when引导时间状语从句时，若从句的主语与主句的主语相同，且在从句谓语中含有be时，通常省略从句的主语和be。when引导时间状语从句，主谓具有被动关系时，省略之后，谓语部分只留过去分词；主谓具有主动关系时，省略之后，谓语部分可以是现在分词、形容词、副词或介词短语。
英语的学习不是一朝一夕的，是需要长时间的积累过程，单词，语法，听力，这些是最基本的，不过最主要的是口语的练习，多听多练是最有效的，最好是可以经常和外国人交流，进行语言的交换，文化的交流也是可以提升外语的。
先看when引导的是什么从句,是宾语从句还是时间状语从句
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 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.
要看when引导的是状语从句、定语从句还是名词性从句。
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