告诉我下面的英语句子是不是这两种写法都对，如果有错，请指出错在哪个，说下理由

We don't write letters in English.

Letters aren't written in English by us.

Letters aren't written by us in English.

We heard her singing a beautiful song yesterday.

A beautiful song was heard to sing by us yesterday.

A beautiful song singsing by her was heard by us yesterday.

We heard her singing a beautiful song yesterday.

A beautiful song was heard to sing by us yesterday.（这句不对，SHE WAS HEARD SINGING A BEAUTIFUL SONG BY US YESTER DAY ）

A beautiful song singsing by her was heard by us yesterday.（A BEAUTIFUL SONG SUNG BY HER WAS HEARD YESTERDAY ，但这样，这意思和原句有点出入，）

A BEAUTIFUL SONG WAS HEARD BY US BEING SUNG BY HER YESTERDAY ，这样意思没变，但还是建议第一种，以SHE作主语

两个句子都是第二种写法正确，这个主要是由句子的句型来决定的

We don't write letters in English 中don't 改成are't 这东东不能用助动词

Letters aren't written in English by us 都以是Letters做主语 了第三人称 用 does 所以为does't

下一题也是如此

下面全对 OK

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