only的语法问题我在书上看到有时放在系动词前,又有的放在系动词后,那到底该怎么看它呢?

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1only用法拾零
许文龙 only是一个在英语中出现频率很高的词,它的意思繁多,用法复杂,不少学生常误用.
一、only用作形容词
1. 与the连用,意为“惟一的”,作定语.如：
John is the only boy in his family.
约翰是家里惟一的男孩.
She is the only girl here who knows how to drive a car.
她是这儿惟一会开车的姑娘.
Jeremy is the only friend who lives near, all my other friends live far away.
杰里米是我惟一住得近的朋友,其余的朋友都住得很远.
2. only可修饰复数名词,意为“仅有的、惟一的一些”,作定语.如：
They were the only people present.
出席的只有他们这些人.
3. 与an连用,意为“单独的”,作定语.如：
Jim was an only son of his parents.
吉姆是他父母的独子.
4. 与the连用,意为“最好的、最适当的”,作定语.如：
She is the only person for the job.
她是做这项工作的最佳人选.
He is the only man for me.
对于我来说,他是最合适的人.
The only thing to do on a hot day is to go swimming.
在热天最理想的事就是去游泳.
二、only用作副词
1. 常位于所修饰的动词、短语或从句前,意为“只是、仅仅”.如：
At present we can only wait and see.
目前我们只好等一等看.
I only touched it.
我只不过摸了它一下.
I only regret that I have but one life to lose for my country.
我惟一遗憾的是：我仅有一次生命可以贡献给我的祖国.
He only walks to save money��he doesn”t really like walking.
他只是为了省钱而步行,并不是真正喜欢步行.
Father gave me this puter only for my birthday. 只是因为我过生日,父亲才送给我这台电脑. My sister is in bed only because she is ill. 我姐姐在床上躺着,仅仅是因为她病了. 2. 意为“反而”.如： Failure only strengthened our determination. 失败反而使我们的决心更坚定了. 3. only和不定式连用常构成结果状语,表示与预料相反的结果,意思是“竟然……、结果……”.如： He studied hard only to fail in the exam. 他这么用功,竟然在考场上失利. He rushed all the way to the station only to miss the train. 他一路冲往车站,结果还是错过了火车. My wife went home in a hurry only to find the door locked. 我妻子急忙回到家,结果却发现门锁着. He tried a second time only to fail again. 他再试一次,竟然还是失败了. 三、用作并列连词 用作并列连词时,意为“但是、可是、可惜、不过”.如： This dictionary is just what I want, only