大学英语（b）大纲的要求第三部分试题为词汇与结构。总分为10分，考试时间为10分钟。
一）词汇部分。
考试重点：名词，代词，介词，连词，形容词和副词，动词短语的搭配和用法。
词汇试题的正确选择在很大程度上取决于考生词汇量的大小，以及运用词汇能力的强弱。但是了解一些解题技巧也会对考试有一定的帮助。下面简单介绍几种词汇测试题中常见的应试技巧。
1．利用表示增加与递进关系的词
这样的词包括：and, again, also，too, besides, moreover, furthermore, but, in addition to等。
2．利用表示比较与对比关系的词
这样的词包括：but, however, although, in contrast, instead of 等。
3．利用表示因果关系的词
这样的词包括：because ,so, as a result, thus, consequently, therefore等。
4. 利用表示让步关系的词
这类词包括：if, although, in spite of, while, whereas等。
5. 根据词法常识判断选择
有些词汇测试题，从词的意义去考虑，填入多个选择项都可以。在这种情况下，如果借助语法结构对题目进行分析，往往可以找到正确答案。
6. 排除法
在做词汇题时，常会遇到一时难以判断哪一个是正确答案的情况。这时不妨从不符合题义的选项着手，将非正确答案逐一排除，剩下的多半就是正确答案。此方法同样适用阅读理解，语法及完形填空部分的试题，在此不再一一举例。
二）语法重点
语法部分主要涵盖以下重点：动词的时态、语态、情态动词、非谓语动词、虚拟语气，以及各种从句等。
语法重点时态
1.一般现在时可以代替将来时，用于时间和条件状语从句中。
return the book immediately to the library as soon as you __it.
a. finish b. are finished c. h**e finished d. are finishing 答案a。
2.在“this is the first time…”结构中，后面的从句用现在完成时。句子开头也可以用it代替this。
例：this is the first time that i h**e met jane.
3.在“it/this is +形容词最高级+名词后面的从句中，用现在完成时。”
例：this is one of the best books __on the subject.
a. that h**e ever been written b. which h**e ever been written c.
that has ever been written d. whatever h**e been written 答案为a。
4.在“it is/has been＋时间段＋since…后边用过去时。”
例：it has been twenty years since i left my hometown.
5.在“no sooner…than”和“hardly… when…”结构中，主句部分用过去完成时，从句部分用过去时。如i had no sooner returned than he called.
6.在“it is (high) time后边的从句中用过去时。”
例：it is time that we had a rest.
语法重点情态动词
1．情态动词后接完成时的用法：情态动词用来表示能力、允许、许诺、可能、必须、劝告、意愿等概念或态度。情态动词无人称变化，在句子中和动词原形一起组成谓语。
只有ought后面接to do。
2．must＋现在完成时结构：这一结构表示对过去一个动作比较有把握的猜测。
例：i believe he __an accident, otherwise he would h**e arrived on time.
a. would h**e had b. could h**e had c. should h**e had d. must h**e had 答案为d。
3．should (ought to )h**e done用来表示本来应该做却没有做的事情。
例：i’m sorry i couldn’t get in touch with him before he left, i __him earlier.
a. had a telephone b. h**e phoned c. should h**e phoned d. should be phoned
答案是c。中文意思是“我很抱歉我没能在他走之前和他联系上，我本应早点儿给他打**的。”
4．could＋现在完成时，表示本来能做的事情而没有做。
例：mary __that coat, but she chose to lend the money to a needy neighbour.
a. could h**e bought b. must h**e bought
c. can buy d. could buy
答案为a。玛丽本来可以买那件大衣的，但是她把钱借给一个更急需的邻居了。
语法重点虚拟语气
虚拟语气是动词的一种特殊形式，用来表达说话人的愿望、请求、意图、建议、惊奇、设想等。虚拟语气是英语语法的难点，考生必须熟练掌握。以下从五个方面介绍。
1．虚拟条件句中虚拟语气的运用。
虚拟条件句从时间上又分为与现在事实相反，与过去事实相反，与将来事实可能相反三种情况。表示与现在事实相反的，if从句用过去式，主句用would（或could, should, might）加原形动词。与过去事实相反的，if从句用过去完成时，主句用would（或could, should, might）+h**e done结构。
与将来事实可能相反的，if 从句用should (或were to)加动词原形，主句用would加动词原形。
例：if a better material __the strength of the part would h**e been increased.
a. had been used b. had been using c. being used d. using 根据前面的讲解，正确答案为a。
2．某些动词后的宾语从句以及某些名词后的表语或同位语从句中虚拟语气的运用，这些动词或名词包括：suggest(suggestion),propose(proposal),advise (advice),demand, insist, order, request, require, recommend, desire, ask, decide等。在这些从句中，谓语形式为should加动词原形，should可以省略。
例：the general’s command was that the soldiers __their fort and carry out more important task.
a. would le**e b. le**e c. left d. h**e left 答案为b。
3．在it is desired(或desirable), it is important等结构后面的主语从句中，动词用原形或should+原形动词。这些结构有： it is suggested, it is requested, it was ordered, it is necessary, it is essential.
it is vital, it is urgent, it is impossible, it is preferable, it is advisable, it was proposed等。
例：it’s desired that she __to teach us at least twice a week,
a. comes b. will come c. come d. may come 答案为c。
4．在would rather, as if/though以及wish后边that从句中虚拟语气的运用。
例：i am too busy these days. i would rather all of you __next month for a dinner.
a. come b. would come c.
came d. h**e come
答案为c。would rather后面的从句中，动词形式用过去式。
5．在it is (high) time后边的that从句中，动词用过去式，表示该做某事了。
例：don’t you think it is time you __smoking?
a. give up b. g**e up
c. would give up d. should give up 答案为b。
语法重点非谓语动词
动词非谓语形式包括不定式，动名词和分词，它们在句子中不能充当谓语，可以分别充当主语、表语、宾语、定语和状语。虽然非谓语形式不能充当谓语，但它们仍然保留了动词的某些特征，比如说它们可以有自己的宾语，补足语或状语以及自己的逻辑主语，能成为句子的独立成分。
动词非谓语形式有一般时、进行时和完成时三种形式以及相应的主动与被动形式。在解答有关动词非谓语形式的试题时，应特别注意以下几点：
1．英语中有些动词后跟不定式作宾语，有些动词后面则接动名词作宾语，还有一些动词的后边既可以接不定式，也可以接动名词，有时意义不变，但有时却在意义上大不相同，所以必须牢记有关非谓语形式的基本知识。
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