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