be bad for後面加什麼形式

請看例句：

It is a bad time for buying a house.

It is a bad time to buy a house. (用動詞不定式也可以)

現在是不適宜於購置房產的時期。

This beach is good for swimming but bad for surfing.

這片海灘適宜游泳而不適合作衝浪運動。