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He was writing an important report when the telephone rang,可

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He was writing an important report when the telephone rang,可不可以改成...
when he was writing an important report ,the telephone rang.可以改成这样吗.
还有 while 的句型.搞不懂哪个后面要接过去进行时.
那是可以还是不可以呢.
He was writing an important report when the telephone rang,可
不能这样改啦
应该是:while He was writing an important report ,the telephone rang
while 的后面强调的是进行时,主句无所谓,但while 的后面一定得是进行时.
when 的后面则一定不能是进行时,主句无所谓.
while 和 when 就是这样的,他们是刚好相反的用法,记住一个,另一个当然也就记住了啦