虚拟语气
1）虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气在条件句中应用比较多。
2）条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。
真实条件句用于陈述语气，假设的情况有可能发生。
一般现在时
shall/will
+
动词原形
祈使句
情态动词一般现在时
例如：If
he
comes,
he
will
bring
his
violin.
如果他来，会带小提琴来的。
The
volleyball
match
will
be
put
off
if
it
___.
A.
will
rain
B.
rains
C.
rained
D.
is
rained
答案B。真实条件句主句为将来时，从句用一般现在时。
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，主句谓语动词不用shall
（will）
+动词原形，而直接用一般现在时的动词形式。
非真实条件句
1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。
a.
与现在事实相反的假设
一般过去时（be用were）should（would）等
+动词原形
例如：If
they
were
here,
they
would
help
you.
如果他们在这儿，会帮助你的。
含义：They
are
not
here,
they
can’t
help
you.
b.
与过去事实相反的假设
过去完成时
should（would）等+
have+
过去分词
例如：If
he
had
come
yesterday,
I
should
/
would
have
told
him
about
it.如果他昨天来的话，我会把这件事告诉他的。
含义：He
did
not
come
yesterday,
so
I
did
not
tell
him
about
it.
c.
表示对将来不大可能发生的事情的假想
一般过去时
should/would等
+
动词原形
were+
不定式
should+
动词原形
例如：If
you
succeeded,
everything
would
be
all
right.
如果你将来成功了，一切都会好的。
If
you
should
succeed,
everything
would
be
all
right.
If
you
were
to
succeed,
everything
would
be
all
right.
含义：You
are
not
likely
to
succeed,
everything
will
be
what
it
is
now.
标签：虚拟语气,区别
