简单句的核心变化
谓语动词有3态(时态,情态,语态)1否(否定)
1、实义动词变否定:
在前面加助动词do/does/did + not + 动词原型。
2、助动词和情态动词否定:
助动词和情态动词直接加not即表示否定。
那么助动词和情态动词有哪些呢?
包括:be动词、情态动词、完成时态中的have等。
例句:American professors did not possess one.
They do not fund peer-reviewed research.
上面两句均是实义动词变否定:助动词+实义动词原型。
To be sure , the future is not all rosy.
is not (be 动词 + not )
With other audiences you mustn"t attempt to cut in with humor ...
mustn"t (情态动词 must + not) 禁止的意思。
... average height ... hasn"t really changed since 1960 .
hasn"t(完成时中的have +not)其中have还考虑了语态。
如果在动词原型前加上助动词,那么就表示强调了。
助动词do/does/did + 动词原型。(强调一般不涉及将来时态)
例句:Although the figure may vary,analysts do agree on another matter;...
But science does provide us with the best available guide to the future ...
It did know he had a poblem.
关于谓语动词强调一般只要求大家能够辨认就行了。
小结:谓语动词的四种变化
1、动词的时态变化
2、动词的情态变化
3、动词的语态变化
4、动词的否定与肯定