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一段英语改错:后面的improving 为什么不改成improved?all后面不用have吗?

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一段英语改错:后面的improving 为什么不改成improved?all后面不用have吗?
i am glad to hear of you again.you want to know that everything is going in our school.in shortly,all has been improving since the school had began to carry on new policles.
一共四处错
1 of 变成from
2 that后加上how
3 shortly改为short
4去掉had
all后面不用have,这里的all解释为“所有”,字典解释为“everthing”,是正式用法.例句:All was dark and silent dowm by the harbour wall .I hope all is well with you..另外,all后面没有用成all of something,不应把它作为复数.
been improving是因为到现在还在改变,并且以后可能还会继续改变.inproved是完成,也就是改变完了.所以在语境中用inproving是完全通顺正确的,所以没必要改.