could continue
Regular verb: continue - continued- continued

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could continue
you could continue
he could continue
we could continue
you could continue
they could continue 	I could be continuing
you could be continuing
he could be continuing
we could be continuing
you could be continuing
they could be continuing	I could have continued
you could have continued
he could have continued
we could have continued
you could have continued
they could have continued	I could have been continuing
you could have been continuing
he could have been continuing
we could have been continuing
you could have been continuing
they could have been continuing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't continue
you couldn't continue
he couldn't continue
we couldn't continue
you couldn't continue
they couldn't continue 	I couldn't be continuing
you couldn't be continuing
he couldn't be continuing
we couldn't be continuing
you couldn't be continuing
they couldn't be continuing	I couldn't have continued
you couldn't have continued
he couldn't have continued
we couldn't have continued
you couldn't have continued
they couldn't have continued	I couldn't have been continuing
you couldn't have been continuing
he couldn't have been continuing
we couldn't have been continuing
you couldn't have been continuing
they couldn't have been continuing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I continue?
could you continue?
could he continue?
could we continue?
could you continue?
could they continue? 	could I be continuing?
could you be continuing?
could he be continuing?
could we be continuing?
could you be continuing?
could they be continuing? 	could I have continued?
could you have continued?
could he have continued?
could we have continued?
could you have continued?
could they have continued? 	could I have been continuing?
could you have been continuing?
could he have been continuing?
could we have been continuing?
could you have been continuing?
could they have been continuing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I continue?
couldn't you continue?
couldn't he continue?
couldn't we continue?
couldn't you continue?
couldn't they continue? 	couldn't I be continuing?
couldn't you be continuing?
couldn't he be continuing?
couldn't we be continuing?
couldn't you be continuing?
couldn't they be continuing? 	couldn't I have continued?
couldn't you have continued?
couldn't he have continued?
couldn't we have continued?
couldn't you have continued?
couldn't they have continued? 	couldn't I have been continuing?
couldn't you have been continuing?
couldn't he have been continuing?
couldn't we have been continuing?
couldn't you have been continuing?
couldn't they have been continuing?