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 must not quiver you must not quiver she must not quiver we must not quiver you must not quiver they must not quiver	I must not be quivering you must not be quivering she must not be quivering we must not be quivering you must not be quivering they must not be quivering
Perfect	V-ing perfect
I must not have quivered you must not have quivered she must not have quivered we must not have quivered you must not have quivered they must not have quivered	I must not have been quivering you must not have been quivering she must not have been quivering we must not have been quivering you must not have been quivering they must not 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
must I not quiver? must you not quiver? must she not quiver? must we not quiver? must you not quiver? must they not quiver?	must I not be quivering? must you not be quivering? must she not be quivering? must we not be quivering? must you not be quivering? must they not be quivering?
Perfect	V-ing perfect
must I not have quivered? must you not have quivered? must she not have quivered? must we not have quivered? must you not have quivered? must they not have quivered?	must I not have been quivering? must you not have been quivering? must she not have been quivering? must we not have been quivering? must you not have been quivering? must they not have been quivering?