promise本身可作名词。
promise:n.诺言;许诺;承诺;获得成功的迹象;吉兆;迹象
'I'll be back soon,' she promised.
“我马上回来。”她答应说。
I can promise you, you'll have a wonderful time.
我保证你会玩得很痛快。
The college principal promised to look into the matter.
学院院长答应研究这个问题。