请帮我分析下这个定语从句（His mother did all she could do） to help him wi

请帮我分析下这个定语从句
（His mother did all she could do） to help him with his study.加上do这个句子是否成立?什么时候要省略do?

bqemnc 1年前已收到4个回答举报

防火枪春芽

共回答了26个问题采纳率：92.3% 举报

这个地方加不加DO都没有问题,只是前面已经有了DO的过去式形式DID,为了避免前后重复,所以一般是不带DO的.

1年前

万里霜天幼苗

共回答了6个问题举报

His mother (who did all she could do)to help........

1年前

zhapter 幼苗

共回答了20个问题举报

用by引出不足多少。这句从句如果还原一下，就是 a sum of money falls short of some reference amount by (多少数量).

1年前

漂浮海盗旗幼苗

共回答了1个问题举报

定语从句也是一个句子，如果把do去掉的话，那么定语从句就不完整了："she could all"，少了谓语。所以应该加上谓语do。

1年前

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你能帮帮他们吗

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