1. 表示某人做某事很聪明，通常用it is clever of sb to do sth。如：
It’s clever of her to refuse him. 她拒绝他那是明智的。
It was clever of you to think of that. 你想到了那一点，真是聪明。
She is clever to refuse him.
You were clever to think of that.
2. be clever at doing sth意为“擅长做某事”，注意其中的介词不能换成in。如：
I’m not clever at cooking. 我不大会做饭。
The Swiss are clever at making watches. 瑞士人善于制表。
3. be clever with sth意为“善于使用某物”。如：
John is clever with his pen. 约翰善于写作。
Mary is clever with her fingers / hands. 玛丽的手很灵巧。