+1
You need not go if you don't want to. You don't need to go if you don't want to. Needn't you go? Don't you need to go? Need you go? Do you need to go?
Are all above grammatical? What is the difference in usage between the two in each pair above? (Is the underlined worded well?) Though I usually say the second one in each pair I hardly hear the other one.
+1
healerYou need not go if you don't want to.
You don't need to go if you don't want to.
Needn't you go?
Don't you need to go?
Need you go?
Do you need to go?

All of the above are grammatically correct.

healerdifference in usage

The first in each pair is old-fashioned and nowadays rarely used.

The only reason a learner of English should know about those is to understand them when you come across them in writing.

CJ

Comments  

Hi there,

"You don't need to" is the correct one, both in written and spoken English.

"You needn't to" is something of the past, or something strictly belong to British English, and not commonly used in daily conversations.

 CalifJim's reply was promoted to an answer.