在表示建議、命令、要求、忠告等動詞的後面,其賓語從句的謂語用「should+動詞原形」表示虛擬語氣
常用的此類動詞有:
表示「要求」的:ask, desire, request, demand, require, beg
表示「提議、勸告、建議」的:move, prpose, suggest, recommend, advise, vote
表示「決定、命令」的:decide, order
表示「主張」的:maintain, urge
表示「同意、堅持」的:consent, insist
例:The doctor suggested that he (should) try to lose his weight.
He insisted that we (should ) tell him the news.
上述動詞的名詞形式,demand, desire, requirment, advice, order, decision, recommendation, suggestion, 以及necessity, preference, plan, motion, idea等名詞,其後的表語從句或同位語從句,也用「should+動詞原形「表示虛擬語氣。現代英語,特別是美國英語,常省去「should」,例:
The advice is that we (should) leave at once.
He idea that we (should)visit Great Wall was warmly welcomed.