could brainstorm
Regular verb: brainstorm - brainstormed- brainstormed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could brainstorm
you could brainstorm
she could brainstorm
we could brainstorm
you could brainstorm
they could brainstorm 	I could be brainstorming
you could be brainstorming
she could be brainstorming
we could be brainstorming
you could be brainstorming
they could be brainstorming	I could have brainstormed
you could have brainstormed
she could have brainstormed
we could have brainstormed
you could have brainstormed
they could have brainstormed	I could have been brainstorming
you could have been brainstorming
she could have been brainstorming
we could have been brainstorming
you could have been brainstorming
they could have been brainstorming	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't brainstorm
you couldn't brainstorm
she couldn't brainstorm
we couldn't brainstorm
you couldn't brainstorm
they couldn't brainstorm 	I couldn't be brainstorming
you couldn't be brainstorming
she couldn't be brainstorming
we couldn't be brainstorming
you couldn't be brainstorming
they couldn't be brainstorming	I couldn't have brainstormed
you couldn't have brainstormed
she couldn't have brainstormed
we couldn't have brainstormed
you couldn't have brainstormed
they couldn't have brainstormed	I couldn't have been brainstorming
you couldn't have been brainstorming
she couldn't have been brainstorming
we couldn't have been brainstorming
you couldn't have been brainstorming
they couldn't have been brainstorming	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I brainstorm?
could you brainstorm?
could she brainstorm?
could we brainstorm?
could you brainstorm?
could they brainstorm? 	could I be brainstorming?
could you be brainstorming?
could she be brainstorming?
could we be brainstorming?
could you be brainstorming?
could they be brainstorming? 	could I have brainstormed?
could you have brainstormed?
could she have brainstormed?
could we have brainstormed?
could you have brainstormed?
could they have brainstormed? 	could I have been brainstorming?
could you have been brainstorming?
could she have been brainstorming?
could we have been brainstorming?
could you have been brainstorming?
could they have been brainstorming? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I brainstorm?
couldn't you brainstorm?
couldn't she brainstorm?
couldn't we brainstorm?
couldn't you brainstorm?
couldn't they brainstorm? 	couldn't I be brainstorming?
couldn't you be brainstorming?
couldn't she be brainstorming?
couldn't we be brainstorming?
couldn't you be brainstorming?
couldn't they be brainstorming? 	couldn't I have brainstormed?
couldn't you have brainstormed?
couldn't she have brainstormed?
couldn't we have brainstormed?
couldn't you have brainstormed?
couldn't they have brainstormed? 	couldn't I have been brainstorming?
couldn't you have been brainstorming?
couldn't she have been brainstorming?
couldn't we have been brainstorming?
couldn't you have been brainstorming?
couldn't they have been brainstorming?