Looking on the internet deeply has found these results:

I don't recognize you is the most popular phrase on the web.

I didn't recognise you 133,100 results on the web	I don't recognize you 1268,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
I didn't recognise you in scrubs. Excuse me, master, I didn't recognise you. Well, hello, I didn't recognise you in uniform. For a moment I didn't recognise you. I didn't recognise you, Thea. I didn't recognise you, General. I didn't recognise you, sir. I didn't recognise you.	You look at me so appalled, 'cause I don't recognize you at all. I know your face but I don't recognize you. I don't recognize you anymore, you're getting more and more watered down every day I don't recognize you, but my parents' TV only gets picture on channel 5 and 7. There must be some mistake here. I don't recognize you. I don't recognize you, Pandora. Sometimes I don't recognize you. I don't recognize you... but for some reason I don't understand... when I see you shedding tears... my heart aches for you.

I didn't recognise you

133,100 results on the web

I don't recognize you

1268,000 results on the web

More popular!

You look at me so appalled, 'cause I don't recognize you at all.
I know your face but I don't recognize you.
I don't recognize you anymore, you're getting more and more watered down every day
I don't recognize you, but my parents' TV only gets picture on channel 5 and 7.
There must be some mistake here. I don't recognize you.
I don't recognize you, Pandora.
Sometimes I don't recognize you.
I don't recognize you... but for some reason I don't understand... when I see you shedding tears... my heart aches for you.