初二英语`````修改病句I don`t know how to do.

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初二英语`````修改病句Idon`tknowhowtodo.初二英语`````修改病句Idon`tknowhowtodo.初二英语`````修改病句Idon`tknowhowtodo.改成Idon''

初二英语`````修改病句I don`t know how to do.
初二英语`````修改病句
I don`t know how to do.

初二英语`````修改病句I don`t know how to do.
改成 I don't know what to do .
或 I don't know how to do it.

楼上是对的,I don`t know how to do. how to do不定式中没有宾语,所以要加it
或者用what 作宾语

i don't know how to do it.