could besiege
Regular verb: besiege - besieged- besieged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could besiege
you could besiege
he could besiege
we could besiege
you could besiege
they could besiege 	I could be besieging
you could be besieging
he could be besieging
we could be besieging
you could be besieging
they could be besieging	I could have besieged
you could have besieged
he could have besieged
we could have besieged
you could have besieged
they could have besieged	I could have been besieging
you could have been besieging
he could have been besieging
we could have been besieging
you could have been besieging
they could have been besieging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't besiege
you couldn't besiege
he couldn't besiege
we couldn't besiege
you couldn't besiege
they couldn't besiege 	I couldn't be besieging
you couldn't be besieging
he couldn't be besieging
we couldn't be besieging
you couldn't be besieging
they couldn't be besieging	I couldn't have besieged
you couldn't have besieged
he couldn't have besieged
we couldn't have besieged
you couldn't have besieged
they couldn't have besieged	I couldn't have been besieging
you couldn't have been besieging
he couldn't have been besieging
we couldn't have been besieging
you couldn't have been besieging
they couldn't have been besieging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I besiege?
could you besiege?
could he besiege?
could we besiege?
could you besiege?
could they besiege? 	could I be besieging?
could you be besieging?
could he be besieging?
could we be besieging?
could you be besieging?
could they be besieging? 	could I have besieged?
could you have besieged?
could he have besieged?
could we have besieged?
could you have besieged?
could they have besieged? 	could I have been besieging?
could you have been besieging?
could he have been besieging?
could we have been besieging?
could you have been besieging?
could they have been besieging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I besiege?
couldn't you besiege?
couldn't he besiege?
couldn't we besiege?
couldn't you besiege?
couldn't they besiege? 	couldn't I be besieging?
couldn't you be besieging?
couldn't he be besieging?
couldn't we be besieging?
couldn't you be besieging?
couldn't they be besieging? 	couldn't I have besieged?
couldn't you have besieged?
couldn't he have besieged?
couldn't we have besieged?
couldn't you have besieged?
couldn't they have besieged? 	couldn't I have been besieging?
couldn't you have been besieging?
couldn't he have been besieging?
couldn't we have been besieging?
couldn't you have been besieging?
couldn't they have been besieging?