He wasn't happy when I asked him a question.

我询问他的时候，他看起来有点不高兴。

I'd better 实战 - SpeakingMax英语口语达人

I've enjoyed reading him so much that when I was asked to write a book about him, I agreed to do so.

因为我非常喜欢他的书,所以有人邀请我写本关于他的书的时候，我就答应了。

耶鲁公开课 - 文学理论导论课程节选