求几个英语单词的区别?

pretty 是pleasant to look at, or (especially of girls or women or things connected with them) attractive or charming in a delicate way的意思即看着很舒服，特别指女孩子和与她们有关的东西很好看:
如That's a pretty hat you're wearing.
The sofa was covered in very pretty flowery material.
She's got such a pretty daughter.

beautiful是
1very attractive很有吸引力:
a beautiful woman
breathtakingly beautiful scenery
She was wearing a beautiful dress.

2very pleasant很舒适享受:
a beautiful piece of music
beautiful weather

3MAINLY US very kind很好:
You did a beautiful thing in helping those poor children.

smart是having a clean, tidy and stylish appearance看起来干净整洁很精明:
Guy looks very smart in his new suit, doesn't he?
I need a smart jacket for my interview.
She works in a very smart new office overlooking the River Cam.

clever是1 having or showing the ability to learn and understand things quickly and easily学