【正文】
t you? 例 3: 你上課不應(yīng)該講話,是嗎 ? He oughtn39。 She oughtn39。 You ought to / should work hard. (一)否定句 had better, should, ought to用于否定句時(shí),否定詞均位于其后,具體形式為:had better not do, shouldn39。 should 比 had better語氣強(qiáng),ought to語氣最強(qiáng)。(但沒有這樣) ?needn’t +have done表示做了本來不必去做的事。 ?might(不用 may) +have done表示“本來可能 …” ,但實(shí)際上沒有發(fā)生的事。 ?could(不用 can)+have done,在肯定句中表示“本來能夠 … 而沒能 …” ,具有婉轉(zhuǎn)的批評(píng)和責(zé)備之意。 must have learned 2,000 words by the end of last term. 到上學(xué)期為止我們一定學(xué)了有兩千個(gè)單詞 。 must have gone to Beijing. 他一定已經(jīng)去北京了。 You could have told me earlier. 你本該早點(diǎn)告訴我的。另外,還可表示“本來應(yīng)該或可以做某事”之意,含有輕微的責(zé)備語氣。 needn’t have gone to the station yesterday. 昨天她本不必到火車站去的 .(昨天她去了) needn’t have bought it. 你本可不必買它的。一般情況下 should與ought to可通用。t / should not do, oughtn‘t to do。t to waste time. (二)一般疑問句 had better, should, ought to用于一般疑問句時(shí),分別將 had, should, ought提至句首。t to speak in class, ought he? ? 1. The flower is dead. I _______ it yesterday. ? A. should water B. must water C. should have watered D. mustn’t have watered ? 2. What time ought I _______? ? A. arrived B. arriving ? C. arrive D. to arrive ? 3. He _______ speak to his mother like that. ? A. ought