本文目录
if only和only if虚拟语气
if only 放句首是不用倒装,但要用虚拟语气
对现在事情的虚拟用 一般过去时态
对过去事情的虚拟用 过去完成时态
对将来事情的虚拟用 could/ would/ should/might +do
only if 不用虚拟语气
only 放句首时限制if 引导的条件状语从句,主句采用半倒装
if only引导的是从句还是主句
only
if
是只有的意思
，用倒装。
例如：Only
if
a
teaccher
has
given
permission
is
a
student
allowed
to
leave
the
room.学生只有得到老师许可才能离开教室
if
only但愿，后用虚拟语气
例如：If
only
I
were
rich！但愿我很富有
If
only
I
knew
her
name.要是知道她的名字就好了！
only if倒装用法例句
在句首的only如果后面跟了副词、介词短语或从句等状语，则主句用倒装结构。如only后跟
的是主语，就不用倒装结构了。例如：
only
when
the
war
was
over
in
1918
was
he
able
to
get
back
to
work．
only
in
this
way
can
you
learn
english
well．
only
after
a
bitter
struggle
was
the
aim
achieved．
only
the
teachers
are
allowed
to
use
the
room．（不倒装）
only
five
men
were
hurt
in
the
accident．（不倒装）
注意，only和所修饰的状语如果不在句首，则不倒装。
如：
the
boy
was
helped
out
only
when
his
father
arrived
in
a
hurry．
only
then
did
he
realize
the
importance
of
english
only if什么时候不倒装
“only﹢if条件句”放在句首，主句谓语用部分倒装。如：
Only if a teacher has given permission is a student allowed to enter this room.
only +状语成分，并放在句首，后面句子需要使用倒装结构
Only if a teacher has given permission is a student allowed to enter this room.
(1)only+介词短语
Only in this way are you able to do it well.
(2)only+时间副词
Only them did I realize my mistake.
“only＋if条件句”放在句首，主句谓语用部分倒装。
Only if a teacher has given permission is a student allowed to enter this room.
Only if you ask many different questions will you acquire all the informationyou need to know.
(3)“only＋when状语从句句”放在句首，主句谓语用部分倒装。
Only when he is seriously ill does he ever stay in bed
Only when you finish your work can you go home .
（备注1：放在句末一般不倒装）
I told him he would succeed only if he tried hard.
我告诉他，只有努力才能成功。
(备注2： 如果only后接的不是状语，则无需倒装。
Only members may use the bar.
主句可以倒装.但不绝对！
Only if 条件从句在前，中间无逗号时主句要倒装!
Only if you have interested in learning，you will learn well. 是对的！
You will learn well only if you have interested in learning. 是对的！
Only if you have interested in learning will you learn it well.主句倒装，也是对的！
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