only if和if only
(1)only if 意思“仅仅如果”,用于引导条件状语从句,比if所表达的语气更强烈。置句首可引起倒装。
eg:Only if a teacher has given permission, is a student allowed to leave the room.
只有得到老师的允许,学生才能离开教室。
(2)if only 用于虚拟语气,表示“要是...就好了“。它用来表达一个不可能实现的愿望或假设。
与过去事实相反,后面跟过去完成时, had+过去分词
与现在事实相反,后面跟一般过去时.
与将来事实相反,后面跟一般过去时或should + 动词原形
eg: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。
你学会了吗?
If only I __play the guitar as well as you!
A. would
B. could
C. should
D. might
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【答案】:选B
【句意】:要是我能像你那样把吉他弹得那么好该多好啊!
【解析】:could表示能够,是一种能力. If only引导的虚拟语气,表示”要是….该多好啊!”
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