在GMAT考试的语法部分，通常会涉及到对if only和as long as的考查。本文将为大家分享关于二者之间的区别及用法，希望对大家的GMAT考试有所帮助。
if only
要是...多好, 只要, 但愿
例句:
She would be a very good player if only she could get it together.
她若能控制得当就能成为很好的选手。
If only one had an unlimited supply of money!
要是财源不断就好了!
If only it clears up, we'll go.
只要天一放晴，我们就去。
as long as
只要; 和 ... 一样长
as long as=so long as=provided that
例句:
He came in with a face as long as a fiddle and said it was raining again.
他拉长着脸进来说，又下雨了。
I don't mind as long as it doesn't rain.
只要不下雨就行了。
As long as you drive carefully, you will be very safe.
如果你开车小心，你就会很安全。
在GMAT语法中，除了if only和as long as容易迷惑考生，还有"persuade"和"convince"：
persuade
“说服”、“劝服”
1. 后面接名词或代词(sb)。
I can persuade the boss soon.我很快就能说服老板。
Can you persuade her?你能说服她吗?
2. 后面接sb. of sth. 表示“使某人相信某事”。
I persuaded him of its truth. 我使他相信这是真的。
3. 后面接sb. to do sth. 表示“说服某人做某事”。
They persuaded her to go with them.他们说服了她和他们一起去。
We will persuade him to take the medicine. 我们将说服他把药吃下去。
4. 后面接sb. into doing sth. 表示“说服某人做某事”。
We persuaded her into taking the job.我们说服了她接受这份工作。
5. 后面接sb. out of doing sth.表示“说服某人不要做某事”。
I persuaded my father out of smoking.我劝服了我父亲戒烟。
6. 后面接sb. that-clause表示“使某人相信……”。
She persuaded me that death does not end all.她说服了我相信死并不能使一切结束。
How can I persuade you that I am grateful to you? 我怎样才能使你相信我对你非常感激呢?
7. 可用于被动结构, 表示“相信”。
I'm almost persuaded that he is honest.我几乎相信他是诚实的。
I'm persuaded of your being right. 我相信你是对的。
错误: persuade that…
convince
使某人确信，说服
convince sb. of sth. 使某人相信……
convince sb. to do sth. 说服某人做某事
convince sb. that…使某人相信……，说服某人……
错误: convince that…
It took a long time to convince me of his guilt.
花了很长时间才使我相信他是有罪的。
How can I convince you of her honesty?
我怎样才能使你相信她是诚实的呢?
What convinced you to vote for them?
究竟是什么使得你愿意投他们的票?
We convinced him to go by car.
我们说服他开车去。
I convinced him to go to the movie.
我说服了他去看电影。
It was hard to convince you (that) we couldn’t afford a new car.
很难想使你相信我们买不起一辆新汽车。
以上就是GMAT语法中关于if only和as long as的考查，以及"persuade"和"convince"的区别，希望考生们在备考过程中能够注意这类词的使用。
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