What about =How about 常用來引起一個問句,表示建議,征求意見或詢問消息,意為"……好不好 ? ","……怎樣 ? ".后面可以接名詞,代詞和動名詞
例如：
I'd like some rice . What about / How about you ?
What about going to see a film ?
要說區(qū)別的話,只能從這兩個詞的本身來比較了.
what是疑問代詞,后常常接名詞代詞等方面的詞；而how是疑問副詞,后常常形容詞副詞動詞等方面的詞.因此,當(dāng)問到：
1. I am going shopping this afternoon. What about you (you是代詞)? 意為：你有什么打算?
2. I haven't seen Li Ping for quite a long time. How about him(him也是代詞)?意為：他近來怎么樣?
3.How about going for a walk (going for a walk動詞轉(zhuǎn)化來的動名詞)? （常用how about）