Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.
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Whydidn''tIthinkofthatbefore?这里的助动词为何用didn''t,而不用don''t.Whydidn''tIthinkofthatbefore?这里的助动词为何用didn''t,而不用
Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.
Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.
Why didn't I think of that before?这里的助动词为何用didn't,而不用don't.
是before 之前的事情,是过去时
问是是刚才说话之前我怎么没想到那个呢？所以要用过去时