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