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用could(not)。例如：He worked hard,but he wasn’t able to pass the exam.
3.will,would,used to:都可表“习惯”意。①will表示不受时间限制的习惯性动作。如：Fish will die out of water./ She’ll sit for hours without saying anything.
②would表示过去习惯性的动作，但不涉及与现在情况的对比。如：He would walk by the river in the morning.注意：would后不能跟表状态动词。例如不能说He would be late for school last year. ③used to表示过去习惯性的动作或状态，但这种习惯现在已不存在了。如：He used to get up early. He used to be late for school.
情态动词考点分析
1.－Could I borrow your dictionary? (NMET) －Yes,of course you________.
A.might B.will C.can D.should
析：B、D意明显不合；A语气不妥，与of course不符。此题Could是表Can意的委婉说法，并非过去时，所以答案应为C。 2.－Shall I tell John about it?
－No,you_________.I’ve told him already. (NMET)
A.needn’t B.wouldn’t C.mustn’t
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D.shoudn’t
析：B意明显不合用，可排除。mustn’t意“不许、不得”，shouldn’t意“不应该”都不合情景。只有needn’t表“不必”与下文“I’ve told him already”相贴切。
3.－There were already five people in the car,but they managed to take me as well.
－It_________a comfortable journey. (NMET) A.can’t be B.shouldn’t be C.mustn’t have been D.couldn’t have been 析：A、B是对现在情况而言，与情景不合。表否定推测不能说mustn’t have been,只有D选项“不可能是”意思切合，时态也对，故为正确答案。
4.The fire spread through the hotel very quickly ，but everyone________get out. (NMET)
A.could B.would C.was able to D.had to
析：根据题干提供的情景B、D皆应排除。在A、C两选项中，因为根据情景要选一个“经过努力能够”这样意思的词，故定答案为C。 5.I told Sally how to get here,but perhaps I________for her.
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A.had to write it out B.must have written it out
C.should have written it out D.ought to write it out 析：A项意“(当时)不得不写出来”，不合题意；D项意“(现在)应写出来”也不合题意；B项意“(当时)肯定已写出来”明显不对。只有表“当初应该写出来”意的C项才合上下文。
6.That young man has made so much noise that he_________not have been allowed to attend the concert. (上海高考题)
A.could B.must C.would D.should
析：若选A。意“不可能已被允许?”与情景不合，应排除；B项不可选；C项意“当时将不会被允许?”也与情况相悖。只有D“should not have been allowed?”表示“当初不该让他?”才合题意。
7.－Can I help you,sir?
－Yes,I bought this radio here yesterday,but it______.(NMET)
A.didn’t work B.couldn’t work C.can’t work D.doesn’t work
析：若选A。意“昨天不响（今天响了）”，不合题目情景；若选B。其意是“当时不能工作（现在能工作了）”，显然不合题；若选C。
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意为“这台收音机根本不能工作（是废品）”这未免显得武断；只有D表“这台机子不响（有毛病）”意才能合理地表达来找商店服务员的原因。
主谓一致（Agreement）
1.“Either A or B＋谓语”结构，谓语取决于Ｂ。
例：Either the students or their teacher dislikes basketball,otherwise they would take part in the basketball match. 但在一般疑问句中，谓语取决于Ａ。
例如：Do either the students or their teacher dislike basketball?
Is either he or you going there?
这种谓语取决于与其最近的主语现象叫做“就近原则”。 ２．“Neither A nor B＋谓语”结构，谓语多取决于Ｂ。但现代英语也出现复数谓语，
理由是neither A nor B是两部分之和，为复数概念，故其后可用复数谓语。
例如：Neither she nor I was(或were)fortunate enough to gain extra points.
她和我都不幸未能获得附加分。
Neither you nor he does(或do)well in maths.
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3．Neither of?接单、复谓(通常视为单数，但在口语中，从意义上亦可视为复数)
None of?接单、复谓
例：Neither of them is(或are)right. None of you is(或are)fit for the job.
4. as well as（以及）
(together)with(以及)B＋谓语”结构，谓语取决于Ａ。 “A along with(以及) but(除去) rather than
例: as well as The trainer along with two gymnasts is in the gym.
(together) with 教练和两个体操运动员在体操房里。
All but Li Dong have passed the test. 除了李东所有人都通过了考试。
Nobody but Li Dong and Wang Hong has passed the test. 除了李东和王宏没有什么人通过那场考试。
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