must slub
Regular verb: slub - slubed- slubed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must slub
you must slub
he must slub
we must slub
you must slub
they must slub 	I must be slubing
you must be slubing
he must be slubing
we must be slubing
you must be slubing
they must be slubing	I must have slubed
you must have slubed
he must have slubed
we must have slubed
you must have slubed
they must have slubed	I must have been slubing
you must have been slubing
he must have been slubing
we must have been slubing
you must have been slubing
they must have been slubing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not slub
you must not slub
he must not slub
we must not slub
you must not slub
they must not slub 	I must not be slubing
you must not be slubing
he must not be slubing
we must not be slubing
you must not be slubing
they must not be slubing	I must not have slubed
you must not have slubed
he must not have slubed
we must not have slubed
you must not have slubed
they must not have slubed	I must not have been slubing
you must not have been slubing
he must not have been slubing
we must not have been slubing
you must not have been slubing
they must not have been slubing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I slub?
must you slub?
must he slub?
must we slub?
must you slub?
must they slub? 	must I be slubing?
must you be slubing?
must he be slubing?
must we be slubing?
must you be slubing?
must they be slubing? 	must I have slubed?
must you have slubed?
must he have slubed?
must we have slubed?
must you have slubed?
must they have slubed? 	must I have been slubing?
must you have been slubing?
must he have been slubing?
must we have been slubing?
must you have been slubing?
must they have been slubing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not slub?
must you not slub?
must he not slub?
must we not slub?
must you not slub?
must they not slub? 	must I not be slubing?
must you not be slubing?
must he not be slubing?
must we not be slubing?
must you not be slubing?
must they not be slubing? 	must I not have slubed?
must you not have slubed?
must he not have slubed?
must we not have slubed?
must you not have slubed?
must they not have slubed? 	must I not have been slubing?
must you not have been slubing?
must he not have been slubing?
must we not have been slubing?
must you not have been slubing?
must they not have been slubing?