I could entail you could entail he could entail we could entail you could entail they could entail
V-ing form
I could be entailing you could be entailing he could be entailing we could be entailing you could be entailing they could be entailing
Perfect
I could have entailed you could have entailed he could have entailed we could have entailed you could have entailed they could have entailed
V-ing perfect
I could have been entailing you could have been entailing he could have been entailing we could have been entailing you could have been entailing they could have been entailing
Negation
Simple form
I couldn't entail you couldn't entail he couldn't entail we couldn't entail you couldn't entail they couldn't entail
V-ing form
I couldn't be entailing you couldn't be entailing he couldn't be entailing we couldn't be entailing you couldn't be entailing they couldn't be entailing
Perfect
I couldn't have entailed you couldn't have entailed he couldn't have entailed we couldn't have entailed you couldn't have entailed they couldn't have entailed
V-ing perfect
I couldn't have been entailing you couldn't have been entailing he couldn't have been entailing we couldn't have been entailing you couldn't have been entailing they couldn't have been entailing
Interrogative form
Simple form
could I entail? could you entail? could he entail? could we entail? could you entail? could they entail?
V-ing form
could I be entailing? could you be entailing? could he be entailing? could we be entailing? could you be entailing? could they be entailing?
Perfect
could I have entailed? could you have entailed? could he have entailed? could we have entailed? could you have entailed? could they have entailed?
V-ing perfect
could I have been entailing? could you have been entailing? could he have been entailing? could we have been entailing? could you have been entailing? could they have been entailing?
Interro-negative form
Simple form
couldn't I entail? couldn't you entail? couldn't he entail? couldn't we entail? couldn't you entail? couldn't they entail?
V-ing form
couldn't I be entailing? couldn't you be entailing? couldn't he be entailing? couldn't we be entailing? couldn't you be entailing? couldn't they be entailing?
Perfect
couldn't I have entailed? couldn't you have entailed? couldn't he have entailed? couldn't we have entailed? couldn't you have entailed? couldn't they have entailed?
V-ing perfect
couldn't I have been entailing? couldn't you have been entailing? couldn't he have been entailing? couldn't we have been entailing? couldn't you have been entailing? couldn't they have been entailing?