must swamp
Regular verb: swamp - swamped- swamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must swamp
you must swamp
he must swamp
we must swamp
you must swamp
they must swamp 	I must be swamping
you must be swamping
he must be swamping
we must be swamping
you must be swamping
they must be swamping	I must have swamped
you must have swamped
he must have swamped
we must have swamped
you must have swamped
they must have swamped	I must have been swamping
you must have been swamping
he must have been swamping
we must have been swamping
you must have been swamping
they must have been swamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't swamp
you mustn't swamp
he mustn't swamp
we mustn't swamp
you mustn't swamp
they mustn't swamp 	I mustn't be swamping
you mustn't be swamping
he mustn't be swamping
we mustn't be swamping
you mustn't be swamping
they mustn't be swamping	I mustn't have swamped
you mustn't have swamped
he mustn't have swamped
we mustn't have swamped
you mustn't have swamped
they mustn't have swamped	I mustn't have been swamping
you mustn't have been swamping
he mustn't have been swamping
we mustn't have been swamping
you mustn't have been swamping
they mustn't have been swamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I swamp?
must you swamp?
must he swamp?
must we swamp?
must you swamp?
must they swamp? 	must I be swamping?
must you be swamping?
must he be swamping?
must we be swamping?
must you be swamping?
must they be swamping? 	must I have swamped?
must you have swamped?
must he have swamped?
must we have swamped?
must you have swamped?
must they have swamped? 	must I have been swamping?
must you have been swamping?
must he have been swamping?
must we have been swamping?
must you have been swamping?
must they have been swamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I swamp?
mustn't you swamp?
mustn't he swamp?
mustn't we swamp?
mustn't you swamp?
mustn't they swamp? 	mustn't I be swamping?
mustn't you be swamping?
mustn't he be swamping?
mustn't we be swamping?
mustn't you be swamping?
mustn't they be swamping? 	mustn't I have swamped?
mustn't you have swamped?
mustn't he have swamped?
mustn't we have swamped?
mustn't you have swamped?
mustn't they have swamped? 	mustn't I have been swamping?
mustn't you have been swamping?
mustn't he have been swamping?
mustn't we have been swamping?
mustn't you have been swamping?
mustn't they have been swamping?