must chirp
Verbo regular: chirp - chirped- chirped

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must chirp
you must chirp
she must chirp
we must chirp
you must chirp
they must chirp 	I must be chirping
you must be chirping
she must be chirping
we must be chirping
you must be chirping
they must be chirping	I must have chirped
you must have chirped
she 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
she must have been chirping
we must have been chirping
you must have been chirping
they must have been chirping	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not chirp
you must not chirp
she 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
she must not be chirping
we must not be chirping
you must not be chirping
they must not be chirping	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	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	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I chirp?
must you chirp?
must she chirp?
must we chirp?
must you chirp?
must they chirp? 	must I be chirping?
must you be chirping?
must she be chirping?
must we be chirping?
must you be chirping?
must they be chirping? 	must I have chirped?
must you have chirped?
must she 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 she have been chirping?
must we have been chirping?
must you have been chirping?
must they have been chirping? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not chirp?
must you not chirp?
must she 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 she not be chirping?
must we not be chirping?
must you not be chirping?
must they not be chirping? 	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? 	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?