should snigger
Regular verb: snigger - sniggered- sniggered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd snigger
you'd snigger
she'd snigger
we'd snigger
you'd snigger
they'd snigger 	I'd be sniggering
you'd be sniggering
she'd be sniggering
we'd be sniggering
you'd be sniggering
they'd be sniggering	I should've sniggered
you should've sniggered
she should've sniggered
we should've sniggered
you should've sniggered
they should've sniggered	I should've been sniggering
you should've been sniggering
she should've been sniggering
we should've been sniggering
you should've been sniggering
they should've been sniggering	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I snigger?
should you snigger?
should she snigger?
should we snigger?
should you snigger?
should they snigger? 	should I be sniggering?
should you be sniggering?
should she be sniggering?
should we be sniggering?
should you be sniggering?
should they be sniggering? 	should I have sniggered?
should you have sniggered?
should she have sniggered?
should we have sniggered?
should you have sniggered?
should they have sniggered? 	should I have been sniggering?
should you have been sniggering?
should she have been sniggering?
should we have been sniggering?
should you have been sniggering?
should they have been sniggering? 	

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