How about a drink tonight?這句那一個是動詞?

題目：

How about a drink tonight?這句那一個是動詞?
好像drink是名詞,因爲前面有a,那動詞呢?
How about having a walk?這句having 和 walk又分別是什麼詞呢?

解答：

這沒有動詞,是個省略句,相當於How about having a drink tonight?