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How about... 與 What about... 的使用, 依所問的目的來區別:

How about...?
= How do you feel about....?
是作建議徵求同意.
例:
How about going to a movie after dinner?

What about...?
= What do you think about....?
是討論中作反問或加問.
例: 
A: It's good for your health to stop smoking.
B: What about drinking?


順便請教關於"could+have+p.p"的用法
You could have given me more time to get ready.
你本應可多給我一點時間來準備好的.
You could have completed it sooner.
你本該早些完成它的.
  
could have p.p.是假設語氣的應用, 表對於過去事件的推測或告誡.

否定句舉例:
She couldn't have agreed to come because she had to go on a trip.
她應該是不會答應來的, 因為他得要出門遠行.

疑問句舉例:
What could he have done to cause such a mess here?
他究竟幹了啥事把這裡搞得一團糟?