I must brainstorm you must brainstorm he must brainstorm we must brainstorm you must brainstorm they must brainstorm
V-ing form
I must be brainstorming you must be brainstorming he must be brainstorming we must be brainstorming you must be brainstorming they must be brainstorming
Perfect
I must have brainstormed you must have brainstormed he must have brainstormed we must have brainstormed you must have brainstormed they must have brainstormed
V-ing perfect
I must have been brainstorming you must have been brainstorming he must have been brainstorming we must have been brainstorming you must have been brainstorming they must have been brainstorming
Negation
Simple form
I must not brainstorm you must not brainstorm he must not brainstorm we must not brainstorm you must not brainstorm they must not brainstorm
V-ing form
I must not be brainstorming you must not be brainstorming he must not be brainstorming we must not be brainstorming you must not be brainstorming they must not be brainstorming
Perfect
I must not have brainstormed you must not have brainstormed he must not have brainstormed we must not have brainstormed you must not have brainstormed they must not have brainstormed
V-ing perfect
I must not have been brainstorming you must not have been brainstorming he must not have been brainstorming we must not have been brainstorming you must not have been brainstorming they must not have been brainstorming
Interrogative form
Simple form
must I brainstorm? must you brainstorm? must he brainstorm? must we brainstorm? must you brainstorm? must they brainstorm?
V-ing form
must I be brainstorming? must you be brainstorming? must he be brainstorming? must we be brainstorming? must you be brainstorming? must they be brainstorming?
Perfect
must I have brainstormed? must you have brainstormed? must he have brainstormed? must we have brainstormed? must you have brainstormed? must they have brainstormed?
V-ing perfect
must I have been brainstorming? must you have been brainstorming? must he have been brainstorming? must we have been brainstorming? must you have been brainstorming? must they have been brainstorming?
Interro-negative form
Simple form
must I not brainstorm? must you not brainstorm? must he not brainstorm? must we not brainstorm? must you not brainstorm? must they not brainstorm?
V-ing form
must I not be brainstorming? must you not be brainstorming? must he not be brainstorming? must we not be brainstorming? must you not be brainstorming? must they not be brainstorming?
Perfect
must I not have brainstormed? must you not have brainstormed? must he not have brainstormed? must we not have brainstormed? must you not have brainstormed? must they not have brainstormed?
V-ing perfect
must I not have been brainstorming? must you not have been brainstorming? must he not have been brainstorming? must we not have been brainstorming? must you not have been brainstorming? must they not have been brainstorming?