could swamp
Regular verb: swamp - swamped- swamped

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

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

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

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