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