放在句首的并不一定就是主語.用when and where開頭的句子,真正的主語是when and where之后的助動詞(或情態(tài)動詞或be動詞)再后的成份.所以,謂語動詞用單數(shù)還是復(fù)數(shù),取決于助動詞(或情態(tài)動詞或be動詞)再后的成份,即主語.
如When and where does he join the Young Pioneers?他是何時何地加入少先隊的?此句,主語是he,不是when and where.when and where是副詞,分別作時間和地點狀語.由于he是單數(shù),所以用且動詞does.
再如,When and where were they playing games?他們是何時何地玩游戲來著?they是主語,所以用were.