serve 还是 serve for
请看下面的题目：
No matter how much youve learned and how high a standard of education you have had, you must _________ the people heart and soul.
A. serve B. serve for C. serve to D. serve on
【分析】 容易误选B，即字对字地翻译汉语的全心全意为人民服务，将其中的为译为 for。
其实，此题答案要选A，serve 意为为服务，可直接用作及物动词，其后不能按汉语意思误加介词 for。请看以下类似例子：
I _________ you yesterday, but you werent in.
A. rang B. rang to C. rang with D. rang to
答案选A，ring 可以用作及物动词，表示给打电话，故其后不用介词。
Neither of her parents wanted her to _________ her cousin.
A. marry B. marry to C. marry with D. marry for
答案选A，marry 可用作及物或不及物动词，用作及物动词时它的意思与结婚，而不仅仅是结婚，也就是说，后接宾语时，无需用介词 to, with 等。
How can I _________ you, Mr. Green?
A. contact B. contact with C. contact to D. contact for
答案选A，contact 为及物动词，表示与联系，其后不接介词。