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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
onlyif的用法是什么?
用法：only if表示"只有...才..."。当only if放在句首时，应该用倒装句型。所谓倒装句型，就是将句子中的"助动词"提前。
读音：
英 [ˈəunli if] 美 [ˈonli ɪf]
解释：
除非;只要…就;只有，只有当…
1.I'll do that, but only if we set a few rules.
我可以干，但我们得定几条规矩。
2.The placebo effect can be understood only if we acknowledge the unity of mind and body.
只有我们承认身心一体，安慰剂效果才能被理解。
3.The lawyer is paid only if he wins
只有官司赢了才支付律师费。
4.You can make progress only if you are modest.
惟虚心乃能进步。
5.Political attacks work only if they find an echo with voters.
政治攻击只有在选民中引起共鸣才会有作用。
6.The meat market can continue only if it is radically overhauled to conform with strict Europeanstandards.
肉类市场只有经过彻底的大检查，严格遵守欧洲标准，才能继续营业。
7.Syria will attend only if the negotiations deal with issues of substance.
只有在谈判涉及重大问题时叙利亚才会参加。
Only if a teacher has given permission is a stude
这是 only if 引导的倒装句，意思是“只有老师同意，学生才能够离开房间。”
你断句错了喔，应该是Only if a teacher has given permission / is a student allowed to leave the room. (原语序应该是a student is allowed to leave the room，但是倒装句要把动词提到前面，所以就变成了is a student allowed to leave the room)
only if后面用倒装吗
only在句首要倒装的情况
Only in this way, can you learn English well.
Only after being asked three times did he come to the meeting.
如果句子为主从复合句，则主句倒装，从句不倒装
Only when he is seriously ill, does he ever stay in bed.
only if 的倒装情况和only 一样的哈
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