English verb conjugation
MUST QUIVER

Regular verb: quiver - quivered - quivered

Affirmation

Simple form	V-ing form
I must quiver you must quiver he must quiver we must quiver you must quiver they must quiver	I must be quivering you must be quivering he must be quivering we must be quivering you must be quivering they must be quivering
Perfect	V-ing perfect
I must have quivered you must have quivered he must have quivered we must have quivered you must have quivered they must have quivered	I must have been quivering you must have been quivering he must have been quivering we must have been quivering you must have been quivering they must have been quivering

Negation

Simple form	V-ing form
I mustn't quiver you mustn't quiver he mustn't quiver we mustn't quiver you mustn't quiver they mustn't quiver	I mustn't be quivering you mustn't be quivering he mustn't be quivering we mustn't be quivering you mustn't be quivering they mustn't be quivering
Perfect	V-ing perfect
I mustn't have quivered you mustn't have quivered he mustn't have quivered we mustn't have quivered you mustn't have quivered they mustn't have quivered	I mustn't have been quivering you mustn't have been quivering he mustn't have been quivering we mustn't have been quivering you mustn't have been quivering they mustn't have been quivering

Interrogative form

Simple form	V-ing form
must I quiver? must you quiver? must he quiver? must we quiver? must you quiver? must they quiver?	must I be quivering? must you be quivering? must he be quivering? must we be quivering? must you be quivering? must they be quivering?
Perfect	V-ing perfect
must I have quivered? must you have quivered? must he have quivered? must we have quivered? must you have quivered? must they have quivered?	must I have been quivering? must you have been quivering? must he have been quivering? must we have been quivering? must you have been quivering? must they have been quivering?

Interro-negative form

Simple form	V-ing form
mustn't I quiver? mustn't you quiver? mustn't he quiver? mustn't we quiver? mustn't you quiver? mustn't they quiver?	mustn't I be quivering? mustn't you be quivering? mustn't he be quivering? mustn't we be quivering? mustn't you be quivering? mustn't they be quivering?
Perfect	V-ing perfect
mustn't I have quivered? mustn't you have quivered? mustn't he have quivered? mustn't we have quivered? mustn't you have quivered? mustn't they have quivered?	mustn't I have been quivering? mustn't you have been quivering? mustn't he have been quivering? mustn't we have been quivering? mustn't you have been quivering? mustn't they have been quivering?