情態(tài)動(dòng)詞只有情態(tài)意義-資料下載頁(yè)
2025-08-04 00:43本頁(yè)面
【正文】 表示反勸的特殊的表推測(cè)的形式 1). could + have + PP表示本來能做到，但事實(shí)上沒有做到。 He could have finished the task on time, but the heavy snow came. 2). couldn’t +have + PP表示本來不能做到，但已經(jīng)做到了。 She could not have covered the whole distance, but in fact she arrived ahead of time. 3) needn’t + have + pp表示本不必做的，但已經(jīng)做到了。 She needn’t have attended the meeting yesterday, but she did. 4.) should/ought to +have + PP表示 該做而沒有做 The plant is dead. I should/ought to have given ot more water. 5) shouldn’t/ oughtn’t to +have + PP表示 不該做而做了。 You oughtn’t to / shouldn’t have taken her bike without permission. 5. 記住下面對(duì)比： must只能用于肯定句（它的否定句和疑問句其實(shí)就用can來代替了） + have + PP 表示對(duì)過去肯定的推測(cè)，譯為“一定是，準(zhǔn)是” The road is wet. It must have rained yesterday. + have + PP 表示對(duì)過去的推測(cè)（限于問句中） Can she have said so? 他可能這樣說嗎？ ’t + have + PP 表示對(duì)過去的否定推測(cè) He cannot have said such a foolish thing. 情態(tài)動(dòng)詞表推測(cè)的反意疑問句 情態(tài)動(dòng)詞表推測(cè)的反意疑問句，簡(jiǎn)單來說，就是以情態(tài)動(dòng)詞后的時(shí)態(tài)為淮，如句子里有明確的時(shí)間狀語，則以其為準(zhǔn)。以 must 為例： eg. 1. You must be hungry now, aren’t you? 2. He must be watching TV , isn’t he ? 3 Tom must have lived her for a long time, hasn’t he ? 4. She must have arrived yesterday, didn’t she? 注：如選擇題中（以She must have arrived yesterday, didn’t she？為例）既有didn’t she又有hasn’t she則以didn’t she？為最佳答案7
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