I must chirp you must chirp she must chirp we must chirp you must chirp they must chirp
Forme en V-ing
I must be chirping you must be chirping she must be chirping we must be chirping you must be chirping they must be chirping
Perfect
I must have chirped you must have chirped she must have chirped we must have chirped you must have chirped they must have chirped
Perfect en V-ing
I must have been chirping you must have been chirping she must have been chirping we must have been chirping you must have been chirping they must have been chirping
Négation
Forme simple
I must not chirp you must not chirp she must not chirp we must not chirp you must not chirp they must not chirp
Forme en V-ing
I must not be chirping you must not be chirping she must not be chirping we must not be chirping you must not be chirping they must not be chirping
Perfect
I must not have chirped you must not have chirped she must not have chirped we must not have chirped you must not have chirped they must not have chirped
Perfect en V-ing
I must not have been chirping you must not have been chirping she must not have been chirping we must not have been chirping you must not have been chirping they must not have been chirping
Forme interrogative
Forme simple
must I chirp? must you chirp? must she chirp? must we chirp? must you chirp? must they chirp?
Forme en V-ing
must I be chirping? must you be chirping? must she be chirping? must we be chirping? must you be chirping? must they be chirping?
Perfect
must I have chirped? must you have chirped? must she have chirped? must we have chirped? must you have chirped? must they have chirped?
Perfect en V-ing
must I have been chirping? must you have been chirping? must she have been chirping? must we have been chirping? must you have been chirping? must they have been chirping?
Forme interro-négative
Forme simple
must I not chirp? must you not chirp? must she not chirp? must we not chirp? must you not chirp? must they not chirp?
Forme en V-ing
must I not be chirping? must you not be chirping? must she not be chirping? must we not be chirping? must you not be chirping? must they not be chirping?
Perfect
must I not have chirped? must you not have chirped? must she not have chirped? must we not have chirped? must you not have chirped? must they not have chirped?
Perfect en V-ing
must I not have been chirping? must you not have been chirping? must she not have been chirping? must we not have been chirping? must you not have been chirping? must they not have been chirping?