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