could entertain
Regular verb: entertain - entertained- entertained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could entertain
you could entertain
he could entertain
we could entertain
you could entertain
they could entertain 	I could be entertaining
you could be entertaining
he could be entertaining
we could be entertaining
you could be entertaining
they could be entertaining	I could have entertained
you could have entertained
he could have entertained
we could have entertained
you could have entertained
they could have entertained	I could have been entertaining
you could have been entertaining
he could have been entertaining
we could have been entertaining
you could have been entertaining
they could have been entertaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't entertain
you couldn't entertain
he couldn't entertain
we couldn't entertain
you couldn't entertain
they couldn't entertain 	I couldn't be entertaining
you couldn't be entertaining
he couldn't be entertaining
we couldn't be entertaining
you couldn't be entertaining
they couldn't be entertaining	I couldn't have entertained
you couldn't have entertained
he couldn't have entertained
we couldn't have entertained
you couldn't have entertained
they couldn't have entertained	I couldn't have been entertaining
you couldn't have been entertaining
he couldn't have been entertaining
we couldn't have been entertaining
you couldn't have been entertaining
they couldn't have been entertaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I entertain?
could you entertain?
could he entertain?
could we entertain?
could you entertain?
could they entertain? 	could I be entertaining?
could you be entertaining?
could he be entertaining?
could we be entertaining?
could you be entertaining?
could they be entertaining? 	could I have entertained?
could you have entertained?
could he have entertained?
could we have entertained?
could you have entertained?
could they have entertained? 	could I have been entertaining?
could you have been entertaining?
could he have been entertaining?
could we have been entertaining?
could you have been entertaining?
could they have been entertaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I entertain?
couldn't you entertain?
couldn't he entertain?
couldn't we entertain?
couldn't you entertain?
couldn't they entertain? 	couldn't I be entertaining?
couldn't you be entertaining?
couldn't he be entertaining?
couldn't we be entertaining?
couldn't you be entertaining?
couldn't they be entertaining? 	couldn't I have entertained?
couldn't you have entertained?
couldn't he have entertained?
couldn't we have entertained?
couldn't you have entertained?
couldn't they have entertained? 	couldn't I have been entertaining?
couldn't you have been entertaining?
couldn't he have been entertaining?
couldn't we have been entertaining?
couldn't you have been entertaining?
couldn't they have been entertaining?