【正文】
(= I want the manager to be informed at once.)比較 if only與 only if。only if表示 “只有 ”; if only則表示 “如果 …… 就好了 ”。 If only也可用于陳述語(yǔ)氣。I wake up only if the alarm clock rings. 只有鬧鐘響了,我才會(huì)醒。 If only the alarm clock had rung. 當(dāng)時(shí)鬧鐘響了,就好了。 If only he es early. 但愿他早點(diǎn)回來(lái)。 It is (high) time that。It is (high) time that 后面的從句謂語(yǔ)動(dòng)詞要用過(guò)去式或用 should加動(dòng)詞原形,但 should不可省略。It is time that the children went to bed. It is high time that the children should go to bed. need “不必做 ”和 “本不該做 ”。didn39。t need to do表示: 過(guò)去不必做某事 , 事實(shí)上也沒(méi)做。needn39。t have done表示: 過(guò)去不必做某事 , 但事實(shí)上做了。 例如:John went to the station with the car to meet Mary, so she didn39。t need to walk back home. 約翰開(kāi)車(chē)去車(chē)站接瑪麗,所以她不必步行回家了。 John went to the station with the car to meet Mary, so she needn39。t have walked back home. 約翰開(kāi)車(chē)去車(chē)站接瑪麗,所以她本不必步行回家了。 (Mary步行回家,沒(méi)有遇上 John的車(chē)。 ) 典型例題:There was plenty of time. She ___. A. mustn‘t have hurried B. couldn‘t have hurried C. must not hurry D. needn39。t have hurried答案 D。needn39。t have done. 意為 本不必 ,即已經(jīng)做了某事,而時(shí)實(shí)際上不必要。Mustn39。t have done 用法不正確,對(duì)過(guò)去發(fā)生的事情進(jìn)行否定性推斷應(yīng)為 couldn39。t have done, 不可能已經(jīng) 。 must not do 不可以(用于一般現(xiàn)在時(shí))。Homework:按照虛擬語(yǔ)氣的用法造句。