English verb conjugation
MUST CHIRP

Regular verb: chirp - chirped - chirped

Affirmation

Simple form	V-ing form
I must chirp you must chirp he must chirp we must chirp you must chirp they must chirp	I must be chirping you must be chirping he must be chirping we must be chirping you must be chirping they must be chirping
Perfect	V-ing perfect
I must have chirped you must have chirped he must have chirped we must have chirped you must have chirped they must have chirped	I must have been chirping you must have been chirping he must have been chirping we must have been chirping you must have been chirping they must have been chirping

Negation

Simple form	V-ing form
I must not chirp you must not chirp he must not chirp we must not chirp you must not chirp they must not chirp	I must not be chirping you must not be chirping he must not be chirping we must not be chirping you must not be chirping they must not be chirping
Perfect	V-ing perfect
I must not have chirped you must not have chirped he must not have chirped we must not have chirped you must not have chirped they must not have chirped	I must not have been chirping you must not have been chirping he must not have been chirping we must not have been chirping you must not have been chirping they must not have been chirping

Interrogative form

Simple form	V-ing form
must I chirp? must you chirp? must he chirp? must we chirp? must you chirp? must they chirp?	must I be chirping? must you be chirping? must he be chirping? must we be chirping? must you be chirping? must they be chirping?
Perfect	V-ing perfect
must I have chirped? must you have chirped? must he have chirped? must we have chirped? must you have chirped? must they have chirped?	must I have been chirping? must you have been chirping? must he have been chirping? must we have been chirping? must you have been chirping? must they have been chirping?

Interro-negative form

Simple form	V-ing form
must I not chirp? must you not chirp? must he not chirp? must we not chirp? must you not chirp? must they not chirp?	must I not be chirping? must you not be chirping? must he not be chirping? must we not be chirping? must you not be chirping? must they not be chirping?
Perfect	V-ing perfect
must I not have chirped? must you not have chirped? must he not have chirped? must we not have chirped? must you not have chirped? must they not have chirped?	must I not have been chirping? must you not have been chirping? must he not have been chirping? must we not have been chirping? must you not have been chirping? must they not have been chirping?