>>
>>BTW what's wrong with this sentence.
>>
>>"Did you lost the details on the form?" ?
>
>Lost is past tense, should be did you lose...
>
>I knew it, but somehow I was not sure about lose being present tense when I was writing it and then didn't have time to correct.
>
>Thanks for catching it, though. Much appreciated.
>
>And also I guess I should say details of the form, not ON.

Depends whether you are referring to, say data details ON the form, or details OF the form, such as its colour, size, controls, etc.