我爱上了她 用英语怎么说 ?

I have fallen in love with her.

i fell in love with her
FALL IN LOVE的搭配肯定没问题
个人认为应该用一般过去时

I have fallen in love with her.
or I have a crush on her.
or I have a thing for her.后两种在口语当中较常见。第一种较正式一点。

I have a crush on her.

i feel in love with her.

I have fallen in love with her.