分数和百分数引导的短语作主语,其谓语动词的数应根据分数和百分数后面的名词来确定.如果是可数名词的复数,其谓语动词用复数形式;如果是不可数名词或单数可数名词其谓语动词用单数形式.
II. 句型复习:
18. It is necessary ( for sb. ) to do sth.
句型18中的真正主语是不定式短语,不定式的逻辑主语前必须 用介词 for,主句中的形容词通常是表示重要性,紧迫性,频繁程度,难易,安全等情况的形容词,常见的形容词有:① important, necessary, natural ② easy , safe , common , normal , hard , difficult , dangerous , unusual,
rare , impossible , pleasant
在①中的形容词作表语可以用从句改写,如:
It is important for her to come to the party.
= It is important that she (should ) come to the party
19. It looks ( seems ) as if ...
句型19中的 as if 引导一个状语从句,常译为,"看起来好象..."如果与事实不相符合,则用虚拟语气. It looks as if he is ill.(真的病了)It looks as if he were ill. (没有生病)It seemed as if he were dying.
III.词汇:A. 常用动词用法 (13)
prove
证明 prove sth.
prove that... rove sb. + adj.
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