English verb conjugation
COULD ENTERTAIN

Regular verb: entertain - entertained - entertained

Affirmation

Simple form	V-ing form
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
Perfect	V-ing 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	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
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
Perfect	V-ing 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	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
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?
Perfect	V-ing 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?	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
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?
Perfect	V-ing 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?	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?