2.含有if only的句子
If only they could find a
way to get to the room, or whatever it was, behind the wall.
他们要是能够找到一条通道进入墙壁后面的那个房间，或无论什么地方，该有多好!
特别提示
if only后常接过去时或过去完成时，表达强烈的愿望或遗憾。
If only you hadn’t told
Jackie what I said, everything would have been all right.
要是你没把我的话告诉杰克就好了，那样就不会出什么问题了。
If only I were rich.但愿我很富有。
If only he’d remembered to
send that letter. 要是他没忘记发那封信就好了。
If only he would listen to
reason! 他要是能听得进道理就好了。
相关归纳
(1)only if只有
Only if a teacher has
given permission is a student allowed to leave the room.
学生只有得到老师的许可才能离开教室。
特别提示 : only
if引导的从句放在句首时，主句采用部分倒装语序。
(2)if not不然；要不
I’ll go if you’re going. If
not(=if you don’t go), I’d rather stay at home.
你去我就去，不然的话，我宁愿待在家里。
Do you want that cake. If
not, I’ll have it. 你要那块蛋糕吗？不然我就要了。
(3)if so
Have you got a free evening
next week? If so(=if you have),let’s have dinner.
下周你哪一个晚上有空？如果没事，我们去吃一顿。
特别提示 : 该短语经常用来代替完整的句子，译法较活。
(4)but for若不是，要不是
But for your help, we
wouldn’t have finished the work ahead of time.
要不是有你的帮助，我们就不会提前完成工作。
特别提示: but for等于if it were
not for...； if it hadn’t been for...所在的句子常用虚拟语气。