tom slipped into the house when no one was noticing这句话为什么同过去进行时?是因为when的关系吗?那什么时候用进行时?什么时候不用?为什么这句话不用呢?he had walked three or four miles when he saw a cart,halg-ful
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![tom slipped into the house when no one was noticing这句话为什么同过去进行时?是因为when的关系吗?那什么时候用进行时?什么时候不用?为什么这句话不用呢?he had walked three or four miles when he saw a cart,halg-ful](/uploads/image/z/8827905-57-5.jpg?t=tom+slipped+into+the+house+when+no+one+was+noticing%E8%BF%99%E5%8F%A5%E8%AF%9D%E4%B8%BA%E4%BB%80%E4%B9%88%E5%90%8C%E8%BF%87%E5%8E%BB%E8%BF%9B%E8%A1%8C%E6%97%B6%3F%E6%98%AF%E5%9B%A0%E4%B8%BAwhen%E7%9A%84%E5%85%B3%E7%B3%BB%E5%90%97%3F%E9%82%A3%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8%E8%BF%9B%E8%A1%8C%E6%97%B6%3F%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E4%B8%8D%E7%94%A8%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E8%BF%99%E5%8F%A5%E8%AF%9D%E4%B8%8D%E7%94%A8%E5%91%A2%3Fhe+had+walked+three+or+four+miles+when+he+saw+a+cart%2Chalg-ful)
tom slipped into the house when no one was noticing这句话为什么同过去进行时?是因为when的关系吗?那什么时候用进行时?什么时候不用?为什么这句话不用呢?he had walked three or four miles when he saw a cart,halg-ful
tom slipped into the house when no one was noticing这句话为什么同过去进行时?
是因为when的关系吗?
那什么时候用进行时?什么时候不用?
为什么这句话不用呢?he had walked three or four miles when he saw a cart,halg-full of hay,by the side of the road.
tom slipped into the house when no one was noticing这句话为什么同过去进行时?是因为when的关系吗?那什么时候用进行时?什么时候不用?为什么这句话不用呢?he had walked three or four miles when he saw a cart,halg-ful
Tom slipped into the house when no one was noticing,因为是在当时没有人看见的这个时间溜进去的,说的是这个时间的事,同时发生.也正是这个原因所以才用了When.
he had walked three or four miles when he saw a cart,是当他看见马车的时候已经走了三四公里,一前一后发生的.所以是个完成时态.