Posted by Vinjashira:
when you make it a question does it become

"did you use to be skinny?"

or still

"did you used to be skinny?"

thanks!
It's the second one - "did you used" - but both are improper grammar.

"Were you ever skinny?" is good - but watch the tone of voice. "Were you EVER skinny?" could be an insult! Also, "Were you EVER SKINNY!" could be good - especially if someone is recovering from an eating disorder.

Another way: "Have you always been skinny?" Less risk involved! LOL