在英语中，询问某人心情的常用表达有：

How are you？

How do you feel？

How are you doing？

How are you today？

What's up with you？

How's everything？

Why are you in a bad mood？

Why are you so sad？

Can you tell me why you're sad？

How are you feeling today？

这些表达方式可以根据具体情境选择使用，以表达关心和想要了解对方情绪的目的。