发布网友 发布时间:2022-04-20 21:22
共1个回答
热心网友 时间:2023-07-13 20:56
1.真实条件句
真实条件句用于陈述语气,假设的情况可能发生,其中
if
是如果的意思。
时态关系
句型:条件从句 主句
一般现在时
shall/will/can/may/etc.
+
动词原形
注意:
1)
在真实条件句中,主句不能用be
going
to表示将来,该用shall,
will.
(错)
If
you
leave
now,
you
are
never
going
to
regret
it.
(对)
If
you
leave
now,
you
will
never
regret
it.
2)
表示真理时,主句谓语动词便不用shall
(will)
+动词原形,而直接用一般现在时的动词形式。
2.非真实条件句
1)时态:可以表示过去,现在和将来的情况。它的基本特点是时态退后。
a. 同现在事实相反的假设。
句型
:
条件从句 主句
一般过去时 should/would/could/might+动词原形
b. 表示于过去事实相反的假设。
c. 表示对将来的假想
句型: 条件从句 主句
一般过去时/were+
不定式/should+
动词原形 should/would/could/might+
动词原形
3.混合条件句
主句与从句的动作发生在不同的时间,这时主,从句谓语动词的虚拟语气形式因时间不同而不同,这叫做混合条件句。
4.虚拟条件句的倒装
虚拟条件句的从句部分如果含有were,
should,
或had,
可将if省略,再把were,
should或had
移到从句句首,实行倒装。
注意:
在虚拟语气的从句中,动词'be'的过去时态一律用"were",不用was,
即在从句中be用were代替。
If
I
were
you,
I
would
go
to
look
for
him.
如果我是你,就会去找他。
If
he
were
here,
everything
would
be
all
right.
如果他在这儿,一切都会好的。
典型例题
_____
to
do
the
work,
I
should
do
it
some
other
day.
A.
If
were
IB.
I
were C.
Were
I D.
Was
I
答案C.
在虚拟条件状语中如果有were,
should,
had这三个词,通常将if省略,主语提前,
变成
were,
should,
had
+主语的形式。但要注意,在虚拟条件状语从句中,省略连词的倒装形式的句首不能用动词的缩略形式。如我们可说
Were
I
not
to
do.,
而不能说
Weren't
I
to
do.
5特殊的虚拟语气词:should
1)
It
is
demanded
/
necessary
/
a
pity
+
that…结构中的主语从句的谓语动词要用should
加动词原形,
should
可省略。
句型:
(1)suggested
It
is (2)important that…+
(should)
do
(3)
a
pity
(1)suggested,
ordered,
proposed,
required, demanded,
requested,
insisted;
+
(should)
do
(2)important,
necessary,
natural,
strange
a
pity, a
shame, no
wonder
例:It
is
suggested
that
we
(should)
hold
a
meeting
next
week.
It
is
necessary
that
he
(should)
come
to
our
meeting
tomorrow.
2)在宾语从句中的应用
在表示命令、建议、要求等一类动词后面的从句中。
order,
suggest,
propose,
require,
demand,
request,
insist,
command,
insist
+
(should)
do