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