could snigger
Regular verb: snigger - sniggered- sniggered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't snigger
you couldn't snigger
he couldn't snigger
we couldn't snigger
you couldn't snigger
they couldn't snigger 	I couldn't be sniggering
you couldn't be sniggering
he couldn't be sniggering
we couldn't be sniggering
you couldn't be sniggering
they couldn't be sniggering	I couldn't have sniggered
you couldn't have sniggered
he couldn't have sniggered
we couldn't have sniggered
you couldn't have sniggered
they couldn't have sniggered	I couldn't have been sniggering
you couldn't have been sniggering
he couldn't have been sniggering
we couldn't have been sniggering
you couldn't have been sniggering
they couldn't have been sniggering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I snigger?
couldn't you snigger?
couldn't he snigger?
couldn't we snigger?
couldn't you snigger?
couldn't they snigger? 	couldn't I be sniggering?
couldn't you be sniggering?
couldn't he be sniggering?
couldn't we be sniggering?
couldn't you be sniggering?
couldn't they be sniggering? 	couldn't I have sniggered?
couldn't you have sniggered?
couldn't he have sniggered?
couldn't we have sniggered?
couldn't you have sniggered?
couldn't they have sniggered? 	couldn't I have been sniggering?
couldn't you have been sniggering?
couldn't he have been sniggering?
couldn't we have been sniggering?
couldn't you have been sniggering?
couldn't they have been sniggering?