must swab
Regular verb: swab - swabed- swabed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must swab
you must swab
he must swab
we must swab
you must swab
they must swab 	I must be swabing
you must be swabing
he must be swabing
we must be swabing
you must be swabing
they must be swabing	I must have swabed
you must have swabed
he must have swabed
we must have swabed
you must have swabed
they must have swabed	I must have been swabing
you must have been swabing
he must have been swabing
we must have been swabing
you must have been swabing
they must have been swabing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't swab
you mustn't swab
he mustn't swab
we mustn't swab
you mustn't swab
they mustn't swab 	I mustn't be swabing
you mustn't be swabing
he mustn't be swabing
we mustn't be swabing
you mustn't be swabing
they mustn't be swabing	I mustn't have swabed
you mustn't have swabed
he mustn't have swabed
we mustn't have swabed
you mustn't have swabed
they mustn't have swabed	I mustn't have been swabing
you mustn't have been swabing
he mustn't have been swabing
we mustn't have been swabing
you mustn't have been swabing
they mustn't have been swabing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I swab?
must you swab?
must he swab?
must we swab?
must you swab?
must they swab? 	must I be swabing?
must you be swabing?
must he be swabing?
must we be swabing?
must you be swabing?
must they be swabing? 	must I have swabed?
must you have swabed?
must he have swabed?
must we have swabed?
must you have swabed?
must they have swabed? 	must I have been swabing?
must you have been swabing?
must he have been swabing?
must we have been swabing?
must you have been swabing?
must they have been swabing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I swab?
mustn't you swab?
mustn't he swab?
mustn't we swab?
mustn't you swab?
mustn't they swab? 	mustn't I be swabing?
mustn't you be swabing?
mustn't he be swabing?
mustn't we be swabing?
mustn't you be swabing?
mustn't they be swabing? 	mustn't I have swabed?
mustn't you have swabed?
mustn't he have swabed?
mustn't we have swabed?
mustn't you have swabed?
mustn't they have swabed? 	mustn't I have been swabing?
mustn't you have been swabing?
mustn't he have been swabing?
mustn't we have been swabing?
mustn't you have been swabing?
mustn't they have been swabing?