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
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什么时候不倒装
我告诉他。
only
when
he
is
seriously
ill
does
he
ever
stay
in
bed
only
when
you
finish
your
work
can
you
go
home
，主句谓语用部分倒装“only﹢if条件句”放在句首：
如果only后接的不是状语，则无需倒装。
only
members
may
use
the
bar.
是对的！
only
if
you
have
interested
in
learning
will
you
learn
it
well！
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，主句谓语用部分倒装，并放在句首.
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，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.
主句可以倒装.但不绝对.
“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.html"
target="_blank">https.
（备注1：放在句末一般不倒装）
i
told
him
he
would
succeed
only
if
he
tried
hard！
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推荐于：2017-11-13
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only if 和if only哪个倒装
only位于句首有三种状况会引起句子倒装
1.only+副词
例句：Only then did I realize the importance of study.
2.only +介词短语
本题就是这种状况
3.Only +状语从句（主句倒装,从句不倒装）
例句：Only When I graduated from school,did I realize the importance of study.
但要注意：only +名词或代词作主语,句子不倒装
例句：Only he knows the answer to the question.
only if 是只要的意思,句子不需要倒装,因此本题中的B不正确
only if 和 if only 的区别：
only if表示"只有"；if only则表示"如果……就好了".If only也可用于陈述语气.
I wake up only if the alarm clock rings.只有闹钟响了,我才会醒.
If only the alarm clock had rung.当时闹钟响了,就好了.
If only he comes early.但愿他早点回来.
辨析only if 与 if only
only与if这两个单词随意组合,可以组成两个意义相近,但用法不尽相同的短语only if与if only.现将它们的具体用法辨析如下：
only if意为“only on the condition that,as long as”,“只要；它用于陈述事实或必要的条件,比if所表达的语气更强烈。
You'll pass this course only if you study.只要你学,你就会通过这门课.
Children may enter the club only if they are accompanied by adults.只要孩子们有大人陪同就可以参加俱乐部.
The students at the university can take up part-time job only if it doesn't interfere with their studies.只要不影响学业,这所大学的学生可以从事兼职工作.
if only则有两种含义.第一种含义与only if近似,意为“as long as”,“只要”.
例如：
If only it clears up,we'll go.只要天一放晴,我们就去.第二种则是“expressing a wish or assumption”,“但愿；如果……就好了”.它用来表达一个不可能实现的愿望或假设,句子要用虚拟语气.
例如：
If only she would come!要是她能来就好了!
If only you had told me you had a spare ticket for the show.如果你告诉我,你多了一张演出票就好了.
If only you had worked with greater care!你要是工作更仔细一些该多好!
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