精品文档
精品文档
语法考点之一
:虚拟语?/p>
考点
1. If
从句中的虚拟语气
1
、与过去事实相反:从?/p>
sb had done
,主?/p>
sb would(should, could, might)+ have done
?/p>
2
、省?/p>
if
,从句的语序用到装,即将
were, had
?/p>
should
移至主语的前面,但否定词
not
不前移?/p>
3
、与将来事实相反:从?/p>
sb did (should+do
?/p>
were+to do)
,主?/p>
sb would (should, could, might)+do
?/p>
4
、错综条件句:主句与从句的动作发生在不同的时间段?/p>
比如:从句对过去虚拟,而主句对现在虚拟,即从句
sb had done
,主?/p>
sb would(should, could, might)+do
?/p>
考点
2
?/p>
表示建议?/p>
要求?/p>
命令等动词如
insist, order, command, suggest, advise, propose, ask, require, request,
demand
引导的从句及
it
引导的相应的分词、名词和形容词从句,谓语用(
should)+
动词原形?/p>
考点
3
?/p>
It is +advisable, essential, important, imperative, incredible
等从句,谓语用(
should
?/p>
+
动词原形?/p>
考点
4
?/p>
it is (high/about) time that
的结构中,从句使用一般过去式。例?/p>
:
考点
5
?/p>
much as"
尽管,虽?/p>
"
引导让步状语从句,从句中?/p>
would have done
表示假设?/p>
考点
6
?/p>
if only, wish, as if/as though
引导从句?/p>
与过去事实相反:
had + done
?/p>
与现在事实相反:动词过去式;
与将来事实相反:
could/would + do
考点
7
?/p>
would rather/sooner
从句?/p>
使用一般过去式或过去完成式
分别表示对现在或过去的虚?/p>
考点
8
?/p>
lest / for fear that+(should ) +
原形动词?/p>
语法考点之二
:情态动?/p>
*
情态动?/p>
: will
(愿意)
, shall
(将?/p>
, must
(必须)
, can, may, would, should (
应该
), might, could, ought to, used
to
(过去常常)
, need
(需要)
, dare
(竟敢)
?/p>
have to
(不得不?/p>
考试中,情态动词部分重点测试以下内容:
?/p>
1
)情态动?/p>
+
行为动词完成式(表示推测?/p>
?/p>
2
)某些情态动词的特殊用法
考点
1.
情态动词+
have
+过去分词结构表示推?/p>
(1) must have done
表示推测过去某事
?/p>
一?/p>
?/p>
发生了。否定形式为?/p>
can’t / couldn’t have v
-ed,
表示过去不可?/p>
发生某事?/p>
(2) could have done
表示推测过去某动?/p>
?/p>
很可?/p>
?/p>
发生了?/p>
(3) may / might have done
表示推测过去某事
?/p>
也许
?/p>
发生?/p>
.
(4) ought to / should have done
?/p>
ought not to / shouldn’t have done
用于对已发生的情况表?/p>
?/p>
责备
?/p>
?/p>
?/p>
不满
?/p>
?/p>
分别表示
?/p>
本应?/p>
…?/p>
?/p>
?/p>
本不应该
…?/p>
(5) needn’t have
done
表示过去做了某事,但没有做的必要?/p>
意为
?/p>
本没必要
…?/p>
?/p>
*did not need to do
动作并没发生?/p>