when引导的是什么从句，分析一下从句成分， when引导的是什么从句
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when\u9664\u4e86\u5f15\u5bfc\u72b6\u8bed\u4ece\u53e5\u8fd8\u53ef\u4ee5\u5f15\u5bfc\uff1a
1.\u5bbe\u8bed\u4ece\u53e5\uff1a\u4f8b\u5982 I don`t know when he left here.\u6211\u4e0d\u77e5\u9053\u4ed6\u4e0a\u9762\u65f6\u5019\u79bb\u5f00\u7684.\u6b64\u65f6when\u4f5c\u8fde\u63a5\u8bcd\u5f15\u5bfc\u5bbe\u8bed\u4ece\u53e5.
2.\u5b9a\u8bed\u4ece\u53e5\uff1a\u4f8b\u5982 He left his hometown in that year when his father died.\u4ed6\u5728\u4ed6\u7236\u4eb2\u6b7b\u7684\u90a3\u4e00\u5e74\u79bb\u5f00\u4e86\u4ed6\u7684\u5bb6\u4e61.\u6b64\u65f6when\u4f5c\u8fde\u8bcd\u4fee\u9970that year,\u5f15\u5bfc\u5b9a\u8bed\u4ece\u53e5.
3.\u72b6\u8bed\u4ece\u53e5\u7684\u53e6\u4e00\u4e2a\u4f8b\u5b50\uff1a\u4f8b\u5982 He will go to the doctor`s when it is sunny.\u5f53\u5929\u6674\u65f6,\u4ed6\u5c31\u4f1a\u53bb\u770b\u533b\u751f.\u6b64\u65f6when\u5f15\u5bfc\u72b6\u8bed,\u610f\u601d\u662f\u201c\u5f53...\u65f6\u5019\u201d.
4.\u4e3b\u8bed\u4ece\u53e5\uff1a\u4f8b\u5982When he left here is a question.\u4ed6\u4e0a\u9762\u65f6\u5019\u79bb\u5f00\u8fd9\u513f\u7684\u8fd8\u6ca1\u6709\u4eba\u77e5\u9053.\u6b64\u65f6when\u5f15\u5bfc\u4e3b\u8bed\u4ece\u53e5,\u610f\u601d\u662f\u201c\u4ec0\u4e48\u65f6\u5019\u201d
\u65f6\u95f4\u72b6\u8bed\u4ece\u53e5\uff0c\u72b6\u8bed\u5c31\u662f\u5bf9\u65f6\u95f4\uff0c\u5730\u70b9\u7b49\u7684\u4fee\u9970\uff0c\u5982\u4f60\u7684\u53e5\u5b50\u4e2d\u662f\u5bf9\u65f6\u95f4\u7684\u4fee\u9970\uff0c\u4fee\u9970\u610f\u8bc6\u5230\u91cd\u8981\u6027\u7684\u65f6\u95f4
when 可以引导很多从句：1.宾语从句：例如 I don`t know when he left here.我不知道他上面时候离开的.此时when作连接词引导宾语从句.
2.定语从句：例如 He left his hometown in that year when his father died.他在他父亲死的那一年离开了他的家乡.此时when作连词修饰that year,引导定语从句.
3.状语从句：例如 He will go to the doctor`s when it is sunny.当天晴时,他就会去看医生.此时when引导状语,意思是“当...时候”.
4.主语从句：例如When he left here is a question.他上面时候离开这儿的还没有人知道.此时when引导主语从句,意思是“什么时候”
Firefighters were called when a gas-tank exploded in a backyard of a home on Baihai Road.
when引导时间状语从句，是个连词。
when从句结构：a gas-tank主语 exploded谓 in a backyard of a home on Baihai Road地点状语.
时间状语从句
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绛旓細杩欏彞璇濆綋涓when 寮曞鐨勬槸瀹氳浠庡彞锛淇グ鍓嶉潰鐨刼ne evening.when 闄や簡鍙互寮曞瀹氳浠庡彞涔嬪杩樺彲寮曞鍚嶈瘝鎬т粠鍙ワ細1 涓昏浠庡彞 when he will be back is still unknown.2 瀹捐浠庡彞 we don't know when he will be back.3 琛ㄨ浠庡彞 the question is whenhe will be back.褰撶劧when 鎵寮曞鐨勬渶甯歌鐨...
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