1. 原味表述：have a crush on somebody

解析：To have a romantic infatuation with someone, especially unbeknownst to that person. （迷恋某人）

例句：I'm going to dinner with this girl I have a crush on.

我要和我迷恋的这个女孩吃晚餐。

Did she ever tell him she used to have a crush on his brother?

她告诉他以前曾迷恋于他的哥哥吗?

2. 原味表述：fall for someone

解析：To become completely infatuated with someone; to fall in love with someone.（完全迷恋某人，爱上某人）

例句：The moment I met my wife, I fell for her completely.

我见到我妻子的那刻，我就完全被她迷住了。

It 'll do you no good to fall for Mary .

你为玛丽而倾倒没有好处。

3. 原味表述：have it bad for someone

解析：have意指有，it意指恋情，bad意指相恋程度深过了头；to have it bad for someone系指对某人眷恋得不可收拾，喻指对某人情真意切而不能自拔。

例句：Jim confessed that he had it bad for Lucy, and, worst of all, he couldn't help thinking of her all day long.

Jim坦白他深深地爱恋着Lucy，而且最糟糕的是他禁不住终日思念着。

4. 原味表述：head over heels in love with someone

解析：To be in love with someone very much.（为某人神魂颠倒，沉溺于情海）

例句：——You look like a million dollars today. See the guy over there? He is totally checking you out! I think he is head over heels in love with you.

——你今天看起来美极了！看到那边的那个男孩了吗？他一直在打量你。我想他是深深地爱上你了。

——You don't say! Stop pulling my leg, okay? Anyway, he is not my cup of tea.

——不会吧！别取笑我了，好吗？而且他也不是我的菜。