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訝的 I was amazed at her knowledge of English 。 [小試身手 ]單項選擇 ( )We were all_______ at the_______ result. A. amazing。 amazing B. amazing。 amazed C. amazed。 amazed D. amazed。 amazing 3. We do not have to go to school at 探究點:表示客觀需要的“必須”用 _______ [指點迷津 ]表示客觀需要的“必須” 用 have to。 have to 和 must 的區(qū)別如下: (1)兩詞都是“必須”的意 思, have to 表示客觀的需要, must 表示說話人主觀上的看法,即主觀上的必要。 My brother was very ill, so I had to call the doctor in the middle of the night. 我弟弟病得很厲害,我只得半夜里把醫(yī)生請來。(客觀上需要做這件事) He said that they must work 。(主觀上要做這件事) (2) have to 有人稱、數(shù)和時態(tài)的變化,而 must只有一種形式。但 must 可用于間接引語中表示過去的必要或義務。 He had to look after his sister 。 (3)在否定結構中 don39。t have to 表示“不必”, mustn39。t 表示“禁止”。 You don39。t have to tell him about it.你不一定要把此事告訴他。 You mustn39。t tell him about it.你一定不要把這件事告訴他。 ( ) You_______ smoke in public. A. mustn39。t B. needn39。t C. wouldn39。t D. may not 熱身練習 A.根據(jù)中文提示寫出單詞。 1. They a