could snigger
Verbo regular: snigger - sniggered- sniggered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could snigger
you could snigger
he could snigger
we could snigger
you could snigger
they could snigger 	I could be sniggering
you could be sniggering
he could be sniggering
we could be sniggering
you could be sniggering
they could be sniggering	I could have sniggered
you could have sniggered
he could have sniggered
we could have sniggered
you could have sniggered
they could have sniggered	I could have been sniggering
you could have been sniggering
he could have been sniggering
we could have been sniggering
you could have been sniggering
they could have been sniggering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not snigger
you could not snigger
he could not snigger
we could not snigger
you could not snigger
they could not snigger 	I could not be sniggering
you could not be sniggering
he could not be sniggering
we could not be sniggering
you could not be sniggering
they could not be sniggering	I could not have sniggered
you could not have sniggered
he could not have sniggered
we could not have sniggered
you could not have sniggered
they could not have sniggered	I could not have been sniggering
you could not have been sniggering
he could not have been sniggering
we could not have been sniggering
you could not have been sniggering
they could not have been sniggering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I snigger?
could you snigger?
could he snigger?
could we snigger?
could you snigger?
could they snigger? 	could I be sniggering?
could you be sniggering?
could he be sniggering?
could we be sniggering?
could you be sniggering?
could they be sniggering? 	could I have sniggered?
could you have sniggered?
could he have sniggered?
could we have sniggered?
could you have sniggered?
could they have sniggered? 	could I have been sniggering?
could you have been sniggering?
could he have been sniggering?
could we have been sniggering?
could you have been sniggering?
could they have been sniggering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not snigger?
could you not snigger?
could he not snigger?
could we not snigger?
could you not snigger?
could they not snigger? 	could I not be sniggering?
could you not be sniggering?
could he not be sniggering?
could we not be sniggering?
could you not be sniggering?
could they not be sniggering? 	could I not have sniggered?
could you not have sniggered?
could he not have sniggered?
could we not have sniggered?
could you not have sniggered?
could they not have sniggered? 	could I not have been sniggering?
could you not have been sniggering?
could he not have been sniggering?
could we not have been sniggering?
could you not have been sniggering?
could they not have been sniggering?