To have feelings for somebody. or to be thinking of someone (in general) if it is you that likes someone then: I like him/her. or I am interested in h/h or I am thinking about h/h. it you are talking about someone : I like him/her or I am interested in h/h and finally, if you are telling someone : i like you or i am thinking of you (usually used when you are talking to or writing to someone who is far away). Hope this helps. 豆中之芽 : i think you mean "I have a CRUSH on him.her"

"I have a strong feeling for him/her."

You just say:i like u

可以说“have a crash on her/him"