Do-Support

It is well-known that English requires a mechanism called `do-support' for negated sentences and for inverted yes-no questions without auxiliaries.

(333)0(333

(334)

John does not want a car .  (334)0(334

(335)

$\ast$John not wants a car .  (335)0(335

(336)

John will not want a car .  (336)0(336

(337)

Do you want to leave home ?  (337)0(337

(338)

$\ast$want you to leave home ?  (338)0(338

(339)

will you want to leave home ?