when引導什么從句?

　　I didn't use to like him much when we were at school.

　　以前我們同學時，我并不太喜歡他。

　　When is the best time to ring New York?

　　什么時間給紐約打電話最好？

　　Text me when you're on your way.

　　路上給我發短信吧。

　　When do the new regulations come into force?

　　新規章什么時候開始執行？

　　I try not to stress out when things go wrong.

　　出問題時，我盡量不緊張。