could sibilate
Verbo regular: sibilate - sibilated- sibilated

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

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't sibilate
you couldn't sibilate
he couldn't sibilate
we couldn't sibilate
you couldn't sibilate
they couldn't sibilate 	I couldn't be sibilating
you couldn't be sibilating
he couldn't be sibilating
we couldn't be sibilating
you couldn't be sibilating
they couldn't be sibilating	I couldn't have sibilated
you couldn't have sibilated
he couldn't have sibilated
we couldn't have sibilated
you couldn't have sibilated
they couldn't have sibilated	I couldn't have been sibilating
you couldn't have been sibilating
he couldn't have been sibilating
we couldn't have been sibilating
you couldn't have been sibilating
they couldn't have been sibilating	

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

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