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2011托福考试辅导:语法讲解(3)

2011-06-28来源: 满分网浏览量:
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  考点二 their等物主代词

  1.物主代词是常见的名词限定词, 其后既可接可数名词的单复数(his pen, his pens)又可接不可数名词(his time), 但不可与其他的限定词同时出现(部分数词除外), 例如:不能说no my car, my no car,但是可以说 My two red cars

  2.英语中许多习惯用法在表示特指时都用物主代词而不用the, 为的是更突出所属关系,这在TOEFL中是一个常考的点

  例如:Manufacutrers of consumer goods often change the styles of their products.

  这里用their 而不用 the

  例题:

  (1)

  A good exercise program helps teach people to avoid the habits that might shorten the lives.

  应改为: their

  解释: 定冠词the指代不清, 用物主代词their作名词lives的限定语更符合英语习惯, 还可突出lives 与people之间的所属关系

  (2)

  A liquid is similar to a gas because has molecules are not fixed to each other in any specific way.

  应改为: its

  解释: has是动词, 不能修饰名词, 且与从句的谓语冲突, 依句意改为物主代词its作molecules的限定语

  考点三 只接复数名词的限定词

  a (large /small /great /considerable /remarkable) number of, a variety of, a set of, a few, 等表示数的固定词组之后总是接复数名词

  例题:

  (1)

  In mathematical terms, modern algebra is set of objects with rules for connecting or relating those objects.

  应改为: is a set

  解释: a set of是固定词组, 表示一套、一组, 后面接可数名词的复数, 与题中objects吻合

  (2)

  At birth, an infant exhibits a remarkable number of motor response.

  应改为: responses

  解释: 短语a number of 后面要求接可数名词的复数, number前可加某些形容词如great, considerable, remarkable, small 等表示a lot of 或 a few

  注意 “the number of” 和 “a number of”的区别

  The number of boys in Class Five is 25. (五班男孩的数目是25,后面谓语动词用单数)

  A small number of families are able to afford an apartment. (少数家庭能够买得起一套住房, )



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