English verb conjugation
MUST QUIVER

Regular verb: quiver - quivered - quivered

Affirmation

Simple form	V-ing form
I must quiver you must quiver she must quiver we must quiver you must quiver they must quiver	I must be quivering you must be quivering she 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 she 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 she 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 she 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 she 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 she 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 she 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 she quiver? must we quiver? must you quiver? must they quiver?	must I be quivering? must you be quivering? must she 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 she 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 she 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 she 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 she 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 she 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 she have been quivering? mustn't we have been quivering? mustn't you have been quivering? mustn't they have been quivering?