形容词
1. He arrived with his customary promptness. 他像惯常那样准时到达。
2. It is customary to tip the waiter. 给侍者小费是一种习俗。
3. It is customary to give people gifts on their birthday. 送生日礼物是一种社会风气。
4. It is customary with me to do so. 这样做是我的习惯。