must sibilate
Verbo regular: sibilate - sibilated- sibilated

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must sibilate
you must sibilate
he must sibilate
we must sibilate
you must sibilate
they must sibilate 	I must be sibilating
you must be sibilating
he must be sibilating
we must be sibilating
you must be sibilating
they must be sibilating	I must have sibilated
you must have sibilated
he must have sibilated
we must have sibilated
you must have sibilated
they must have sibilated	I must have been sibilating
you must have been sibilating
he must have been sibilating
we must have been sibilating
you must have been sibilating
they must have been sibilating	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not sibilate
you must not sibilate
he must not sibilate
we must not sibilate
you must not sibilate
they must not sibilate 	I must not be sibilating
you must not be sibilating
he must not be sibilating
we must not be sibilating
you must not be sibilating
they must not be sibilating	I must not have sibilated
you must not have sibilated
he must not have sibilated
we must not have sibilated
you must not have sibilated
they must not have sibilated	I must not have been sibilating
you must not have been sibilating
he must not have been sibilating
we must not have been sibilating
you must not have been sibilating
they must not have been sibilating	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I sibilate?
must you sibilate?
must he sibilate?
must we sibilate?
must you sibilate?
must they sibilate? 	must I be sibilating?
must you be sibilating?
must he be sibilating?
must we be sibilating?
must you be sibilating?
must they be sibilating? 	must I have sibilated?
must you have sibilated?
must he have sibilated?
must we have sibilated?
must you have sibilated?
must they have sibilated? 	must I have been sibilating?
must you have been sibilating?
must he have been sibilating?
must we have been sibilating?
must you have been sibilating?
must they have been sibilating? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not sibilate?
must you not sibilate?
must he not sibilate?
must we not sibilate?
must you not sibilate?
must they not sibilate? 	must I not be sibilating?
must you not be sibilating?
must he not be sibilating?
must we not be sibilating?
must you not be sibilating?
must they not be sibilating? 	must I not have sibilated?
must you not have sibilated?
must he not have sibilated?
must we not have sibilated?
must you not have sibilated?
must they not have sibilated? 	must I not have been sibilating?
must you not have been sibilating?
must he not have been sibilating?
must we not have been sibilating?
must you not have been sibilating?
must they not have been sibilating?