YOU SAID:
Do you sit on the chair?
INTO JAPANESE
椅子に座りますか。
BACK INTO ENGLISH
Do you want to sit in a chair?
INTO JAPANESE
椅子に座りませんか。
BACK INTO ENGLISH
Would you like to sit in a chair?
INTO JAPANESE
椅子に座りませんか。
BACK INTO ENGLISH
Would you like to sit in a chair?
That didn't even make that much sense in English.