must sneak
Irregular verb: sneak - sneaked, snuck- snuck

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sneak
you must sneak
he must sneak
we must sneak
you must sneak
they must sneak 	I must be sneaking
you must be sneaking
he must be sneaking
we must be sneaking
you must be sneaking
they must be sneaking	I must have snuck
you must have snuck
he must have snuck
we must have snuck
you must have snuck
they must have snuck	I must have been sneaking
you must have been sneaking
he must have been sneaking
we must have been sneaking
you must have been sneaking
they must have been sneaking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not sneak
you must not sneak
he must not sneak
we must not sneak
you must not sneak
they must not sneak 	I must not be sneaking
you must not be sneaking
he must not be sneaking
we must not be sneaking
you must not be sneaking
they must not be sneaking	I must not have snuck
you must not have snuck
he must not have snuck
we must not have snuck
you must not have snuck
they must not have snuck	I must not have been sneaking
you must not have been sneaking
he must not have been sneaking
we must not have been sneaking
you must not have been sneaking
they must not have been sneaking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sneak?
must you sneak?
must he sneak?
must we sneak?
must you sneak?
must they sneak? 	must I be sneaking?
must you be sneaking?
must he be sneaking?
must we be sneaking?
must you be sneaking?
must they be sneaking? 	must I have snuck?
must you have snuck?
must he have snuck?
must we have snuck?
must you have snuck?
must they have snuck? 	must I have been sneaking?
must you have been sneaking?
must he have been sneaking?
must we have been sneaking?
must you have been sneaking?
must they have been sneaking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not sneak?
must you not sneak?
must he not sneak?
must we not sneak?
must you not sneak?
must they not sneak? 	must I not be sneaking?
must you not be sneaking?
must he not be sneaking?
must we not be sneaking?
must you not be sneaking?
must they not be sneaking? 	must I not have snuck?
must you not have snuck?
must he not have snuck?
must we not have snuck?
must you not have snuck?
must they not have snuck? 	must I not have been sneaking?
must you not have been sneaking?
must he not have been sneaking?
must we not have been sneaking?
must you not have been sneaking?
must they not have been sneaking?