1. He is very useful at English. 
   他精通英语。
2. His wife is very useful at cooking. 
   他的妻子擅长烹调。
3. My wife is very useful at cooking. 
   我的爱人很会做饭。
4. Ann will be a very useful addition to our team. 
   安来到我们队给我们增加了一员干将。
5. With this spirit everyone can be very useful to the people.  
   从这点出发，就可以变为大有利于人民的人。

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