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have
的助动词用法
(
1
)表达完成时态
句型
have
(
has, had
)
+p.p. …
句型
can
(
could
)
, …have + p.p.
例:
He can’t have said such a foolish word.
(他不像是会说了这样傻的话。)
解说:本例句是在表达对过去的推想。
(
2
)
“have”
的惯用句式
句型
had better +V…
例:
You had better go and tell her everything.
(你最好去向她把事情全盘地说明白。)
解说
有些文法学家把本句式的
“had better”
称为半助动词(
Semiauxiliary
verb
),因为
“had better”
之后接原形动词,其本身所表现的功能很像是一个助动
词。
“had better”
不可分开使用,
“had”
亦非过去形式。
实际上
“ had better”
所指的时
间性是现在或将来,若是指过去则用
“had better + have +p.p.”
。本句式绝无
“have/has better +V”
的形式,宜注意。
本句式是用于 表达建议或劝告,言外之意是
“
若不这样做就不好或会有不良
后果
”
。
例:
You had better take an umbrella.
(
If you don’
t do,
it may rain and you’ll get wet.
)
本句式也可用于第三人称。
例:
He had better stop smoking.
(他最好把烟戒掉。)
“had better + V”
的否定是把
“not”置于
“better”
之后,例如:
例:
You had bet
ter not borrow money from your friend’s wife.
(你最好不要向朋友的太太借钱。)
本 句式的
“had”
因发轻音,有时甚至轻到几乎不发音,所以也就常被省略。
例:
You had better take an umbrella with you.
=You’d better take an umbrella with you.
=You better take an umbrella with you.
=Better take an umbrella with you.
(你最好带一把雨伞去吧。)
“had better”
可用
“had best”
来加强语气。
例:
We had best hurry, or we’ll miss the train.
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本文更新与2021-01-24 17:31,由作者提供,不代表本网站立场,转载请注明出处:https://www.bjmy2z.cn/gaokao/561604.html
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