如果你 fancy someone 那就说明你对某人有感觉，喜欢上了这个人。

例句

He's fancied her ever since they first met at college, but he's never been brave enough to ask her out.

I'm sorry. I like you as a friend, but I don't fancy you.

请注意

如果把人换成物 to fancy something 那就是你特想、特渴望这样东西。

例句

I'm parched. I really fancy a nice cup of tea.

I fancy an ice-cream, how about you? Do you want anything?