例句：1.Did Tom do his home work yesterday?When?回答：I want to know if_英语解答

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?

人气：220 ℃　时间：2019-09-09 17:29:32

解答

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