ai字母组合的单词有wait，它的意思是等待。例如，the beautiful girl is waiting for me.这个漂亮的女孩正在等待我。

ai组合的单词还有said.它的意思是说，是say的过去式。例如，she said that she didn't know the answer to the question.她说她不知道这个问题的答案。