must swamp
Regular verb: swamp - swamped- swamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must swamp
you must swamp
she must swamp
we must swamp
you must swamp
they must swamp 	I must be swamping
you must be swamping
she must be swamping
we must be swamping
you must be swamping
they must be swamping	I must have swamped
you must have swamped
she 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
she 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 must not swamp
you must not swamp
she must not swamp
we must not swamp
you must not swamp
they must not swamp 	I must not be swamping
you must not be swamping
she must not be swamping
we must not be swamping
you must not be swamping
they must not be swamping	I must not have swamped
you must not have swamped
she must not have swamped
we must not have swamped
you must not have swamped
they must not have swamped	I must not have been swamping
you must not have been swamping
she must not have been swamping
we must not have been swamping
you must not have been swamping
they must not have been swamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I swamp?
must you swamp?
must she swamp?
must we swamp?
must you swamp?
must they swamp? 	must I be swamping?
must you be swamping?
must she be swamping?
must we be swamping?
must you be swamping?
must they be swamping? 	must I have swamped?
must you have swamped?
must she 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 she 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 	
must I not swamp?
must you not swamp?
must she not swamp?
must we not swamp?
must you not swamp?
must they not swamp? 	must I not be swamping?
must you not be swamping?
must she not be swamping?
must we not be swamping?
must you not be swamping?
must they not be swamping? 	must I not have swamped?
must you not have swamped?
must she not have swamped?
must we not have swamped?
must you not have swamped?
must they not have swamped? 	must I not have been swamping?
must you not have been swamping?
must she not have been swamping?
must we not have been swamping?
must you not have been swamping?
must they not have been swamping?