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