例句：1.Did Tom do his home work yesterday?When?

例句：1.Did Tom do his home work yesterday?When?
回答：I want to know if Tom did his homework yesterday.请问回答中的为什么要过去式did而不用单数第三人称does?

scere 1年前已收到3个回答举报

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lfx66066 幼苗

共回答了23个问题采纳率：87% 举报

因为这是个宾语从句主句是一般现在时从句该用哪个时态就是哪个时态了有yesterday所以用一般过去时

1年前

1

lblaohumao 花朵

共回答了2608个问题举报

因为时间状语是yesterday

1年前

2

千千寒幼苗

共回答了1个问题举报

因为是yesterday的事，tom有没有做作业是昨天的事，即过去的事，用过去式did.

1年前

2

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你能帮帮他们吗

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