English verb conjugation
MUST CURB

Regular verb: curb - curbed - curbed

Affirmation

Simple form	V-ing form
I must curb you must curb he must curb we must curb you must curb they must curb	I must be curbing you must be curbing he must be curbing we must be curbing you must be curbing they must be curbing
Perfect	V-ing perfect
I must have curbed you must have curbed he must have curbed we must have curbed you must have curbed they must have curbed	I must have been curbing you must have been curbing he must have been curbing we must have been curbing you must have been curbing they must have been curbing

Negation

Simple form	V-ing form
I must not curb you must not curb he must not curb we must not curb you must not curb they must not curb	I must not be curbing you must not be curbing he must not be curbing we must not be curbing you must not be curbing they must not be curbing
Perfect	V-ing perfect
I must not have curbed you must not have curbed he must not have curbed we must not have curbed you must not have curbed they must not have curbed	I must not have been curbing you must not have been curbing he must not have been curbing we must not have been curbing you must not have been curbing they must not have been curbing

Interrogative form

Simple form	V-ing form
must I curb? must you curb? must he curb? must we curb? must you curb? must they curb?	must I be curbing? must you be curbing? must he be curbing? must we be curbing? must you be curbing? must they be curbing?
Perfect	V-ing perfect
must I have curbed? must you have curbed? must he have curbed? must we have curbed? must you have curbed? must they have curbed?	must I have been curbing? must you have been curbing? must he have been curbing? must we have been curbing? must you have been curbing? must they have been curbing?

Interro-negative form

Simple form	V-ing form
must I not curb? must you not curb? must he not curb? must we not curb? must you not curb? must they not curb?	must I not be curbing? must you not be curbing? must he not be curbing? must we not be curbing? must you not be curbing? must they not be curbing?
Perfect	V-ing perfect
must I not have curbed? must you not have curbed? must he not have curbed? must we not have curbed? must you not have curbed? must they not have curbed?	must I not have been curbing? must you not have been curbing? must he not have been curbing? must we not have been curbing? must you not have been curbing? must they not have been curbing?