be good at something用法例句：
1. If I were going to be good at something, I had to be the best.
如果我决定要做好某件事，我必定要做得最为出色。
2. I wondered if I could be good at something.
我怀疑自己到底是否擅长做一些事情。
3. If Bill Gates was going to be good at something, it was essential to be the best.
倘若比尔?盖茨决定要做好某件事，他必定会做得最为出色。
4. Learn to paint, dance or anything else you've wanted to do. It's always fun to have an interest and be good at something.
学习绘画跳舞或是其他你一直想做的事情。对一些事情有兴趣或是擅长将是非常有趣的。
5. Therefore, if you want to be really good at something, you have to first set a goal and then put in the hours to get there.
所以，你想在什么事上出类拔萃，那么首先该去做的就是设个目标，然后投入时间去达到它。
be good at doing something用法例句：
1. I didn't think Chris would be any good at fund raising for the society, but she seems to be doing a good job.
我原以为克里斯干不好为社团筹集资金的事，可她似乎干得很出色。
2. But I think to be good at anything you have to have drive and passion, and you want to be perfect is with what you are doing.
我觉的做好任何一件事，必须要有动力和激情，而且对你做的事情要求完美。
3. Only through repeated practice can one be good at doing things.
只有通过反复的练习，你才能擅长一件事。
4. An example would be a basketball player who isn't very good at free throws spending hours and hours just doing free throws while being coached. Not a great time no matter how big of a basketball fan you are.
一位不擅长罚球的篮球运动员在教练的指导下一次又一次地练习罚球就是一个很好的例子。无论你是一个多么忠实的足球粉，这样练习也不会觉得有趣吧?
