I could lazy you could lazy she could lazy we could lazy you could lazy they could lazy
V-ing form
I could be lazying you could be lazying she could be lazying we could be lazying you could be lazying they could be lazying
Perfect
I could have lazied you could have lazied she could have lazied we could have lazied you could have lazied they could have lazied
V-ing perfect
I could have been lazying you could have been lazying she could have been lazying we could have been lazying you could have been lazying they could have been lazying
Negation
Simple form
I couldn't lazy you couldn't lazy she couldn't lazy we couldn't lazy you couldn't lazy they couldn't lazy
V-ing form
I couldn't be lazying you couldn't be lazying she couldn't be lazying we couldn't be lazying you couldn't be lazying they couldn't be lazying
Perfect
I couldn't have lazied you couldn't have lazied she couldn't have lazied we couldn't have lazied you couldn't have lazied they couldn't have lazied
V-ing perfect
I couldn't have been lazying you couldn't have been lazying she couldn't have been lazying we couldn't have been lazying you couldn't have been lazying they couldn't have been lazying
Interrogative form
Simple form
could I lazy? could you lazy? could she lazy? could we lazy? could you lazy? could they lazy?
V-ing form
could I be lazying? could you be lazying? could she be lazying? could we be lazying? could you be lazying? could they be lazying?
Perfect
could I have lazied? could you have lazied? could she have lazied? could we have lazied? could you have lazied? could they have lazied?
V-ing perfect
could I have been lazying? could you have been lazying? could she have been lazying? could we have been lazying? could you have been lazying? could they have been lazying?
Interro-negative form
Simple form
couldn't I lazy? couldn't you lazy? couldn't she lazy? couldn't we lazy? couldn't you lazy? couldn't they lazy?
V-ing form
couldn't I be lazying? couldn't you be lazying? couldn't she be lazying? couldn't we be lazying? couldn't you be lazying? couldn't they be lazying?
Perfect
couldn't I have lazied? couldn't you have lazied? couldn't she have lazied? couldn't we have lazied? couldn't you have lazied? couldn't they have lazied?
V-ing perfect
couldn't I have been lazying? couldn't you have been lazying? couldn't she have been lazying? couldn't we have been lazying? couldn't you have been lazying? couldn't they have been lazying?