English verb conjugation
MUST SHIVER

Regular verb: shiver - shivered - shivered

Affirmation

Simple form	V-ing form
I must shiver you must shiver she must shiver we must shiver you must shiver they must shiver	I must be shivering you must be shivering she must be shivering we must be shivering you must be shivering they must be shivering
Perfect	V-ing perfect
I must have shivered you must have shivered she must have shivered we must have shivered you must have shivered they must have shivered	I must have been shivering you must have been shivering she must have been shivering we must have been shivering you must have been shivering they must have been shivering

Negation

Simple form	V-ing form
I must not shiver you must not shiver she must not shiver we must not shiver you must not shiver they must not shiver	I must not be shivering you must not be shivering she must not be shivering we must not be shivering you must not be shivering they must not be shivering
Perfect	V-ing perfect
I must not have shivered you must not have shivered she must not have shivered we must not have shivered you must not have shivered they must not have shivered	I must not have been shivering you must not have been shivering she must not have been shivering we must not have been shivering you must not have been shivering they must not have been shivering

Interrogative form

Simple form	V-ing form
must I shiver? must you shiver? must she shiver? must we shiver? must you shiver? must they shiver?	must I be shivering? must you be shivering? must she be shivering? must we be shivering? must you be shivering? must they be shivering?
Perfect	V-ing perfect
must I have shivered? must you have shivered? must she have shivered? must we have shivered? must you have shivered? must they have shivered?	must I have been shivering? must you have been shivering? must she have been shivering? must we have been shivering? must you have been shivering? must they have been shivering?

Interro-negative form

Simple form	V-ing form
must I not shiver? must you not shiver? must she not shiver? must we not shiver? must you not shiver? must they not shiver?	must I not be shivering? must you not be shivering? must she not be shivering? must we not be shivering? must you not be shivering? must they not be shivering?
Perfect	V-ing perfect
must I not have shivered? must you not have shivered? must she not have shivered? must we not have shivered? must you not have shivered? must they not have shivered?	must I not have been shivering? must you not have been shivering? must she not have been shivering? must we not have been shivering? must you not have been shivering? must they not have been shivering?