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2015年卫生类职称英语语法:一般过去时态的基本用法及否定结构

2015-02-03 16:50 来源:医学教育网

2015年卫生类职称英语语法之一般过去时态的基本用法及否定结构:

一般过去时态基本用法:

用于表示过去的某时刻或某一时期内的动作或状态。常与表明过去时间的状语连用,如yesterday,then,just now,that month,two days ago,或由when或while等引导的表明过去时间的状语从句。

e.g. We met him last month.

e.g. They stayed at home yesterday.

e.g. He was a doctor.

一般过去时态否定结构的构成:

1) 如果谓语部分是行为动词,在构成否定结构时,需要在谓语结构中的行为动词的前面添加助动词did和否定副词,并且需要把原来谓语部分的过去分词结构还原成动词的原形。

e.g. We met him last month.—— We didn't meet him last month.

e.g. They stayed at home yesterday.-They didn't stay at home yesterday.

2) 如果谓语部分是be动词,在构成否定结构时只需要直接在be的后面添加否定副词not.

e.g. He wasn't out yesterday.

e.g. There wasn't anyone in the room just now. (anyone -anybody)

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