I can be very persuasive when I want to be.

当我想要的时候，我会很有说服力的。

《柯林斯英汉双解大词典》

When I want to buy something in a shop, I ask myself two questions.

当我想在商店买东西时，会问自己两个问题。

youdao

When I want to go out to play with my friends, my mother always says, "Stay at home. Don't waste your time."

当我想出去和我的朋友玩，我的妈妈总是说：“待在家里。别浪费时间了。”

youdao

"When Suna particularly said to me 'I really want to be best,' it was just such an instant affinity.

VOA: special.2010.07.30

This is the name to which I'm going to refer when I want to use this function. All right?

这是我以后使用这个函数式,会采用的名字？

麻省理工公开课 - 计算机科学及编程导论课程节选

So I like, you know, waking up when I want to wake up, working out when I want to work out,

所以，我喜欢，你知道，想起床就起床，想锻炼就锻炼，

关于美军 - SpeakingMax英语口语达人

This is the one I like when I want to hide from the world.

BBC: The perfect trip: Lapland

"That way, when I want to go home, everyone has to go home, " she says.

WSJ: In Napa, Kelly Fleming Blends House and Winery

"When I want to evoke a smell, I use signs that taken separately have no connection with the thing I'm expressing, " Mr. Ellena explains.

WSJ: Book Review: Diary of a Nose | The Perfume Lover