must snigger
Regular verb: snigger - sniggered- sniggered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must snigger
you must snigger
he must snigger
we must snigger
you must snigger
they must snigger 	I must be sniggering
you must be sniggering
he must be sniggering
we must be sniggering
you must be sniggering
they must be sniggering	I must have sniggered
you must have sniggered
he must have sniggered
we must have sniggered
you must have sniggered
they must have sniggered	I must have been sniggering
you must have been sniggering
he must have been sniggering
we must have been sniggering
you must have been sniggering
they must have been sniggering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not snigger
you must not snigger
he must not snigger
we must not snigger
you must not snigger
they must not snigger 	I must not be sniggering
you must not be sniggering
he must not be sniggering
we must not be sniggering
you must not be sniggering
they must not be sniggering	I must not have sniggered
you must not have sniggered
he must not have sniggered
we must not have sniggered
you must not have sniggered
they must not have sniggered	I must not have been sniggering
you must not have been sniggering
he must not have been sniggering
we must not have been sniggering
you must not have been sniggering
they must not have been sniggering	

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

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