Learn English – How to say : I can imagine what you are feeling

phrase-request

For instance if someone tell me something like "I had a bad day then I am tired and bored etc…"
I would like to answer something which means that "okai I can imagine" meaning okai I can understand what you are feeling now.

In my native language which is French we use to say "I can imagine" but I am not sure about English.

thanks

Best Answer

I imagine how you feel.

or:

I can imagine that.

or (cool, but probably not best English - it was a favorite of a former colleague):

I feel you.

or even:

I know, I've been there too.