I must grope you must grope she must grope we must grope you must grope they must grope
V-ing form
I must be groping you must be groping she must be groping we must be groping you must be groping they must be groping
Perfect
I must have groped you must have groped she must have groped we must have groped you must have groped they must have groped
V-ing perfect
I must have been groping you must have been groping she must have been groping we must have been groping you must have been groping they must have been groping
Negation
Simple form
I must not grope you must not grope she must not grope we must not grope you must not grope they must not grope
V-ing form
I must not be groping you must not be groping she must not be groping we must not be groping you must not be groping they must not be groping
Perfect
I must not have groped you must not have groped she must not have groped we must not have groped you must not have groped they must not have groped
V-ing perfect
I must not have been groping you must not have been groping she must not have been groping we must not have been groping you must not have been groping they must not have been groping
Interrogative form
Simple form
must I grope? must you grope? must she grope? must we grope? must you grope? must they grope?
V-ing form
must I be groping? must you be groping? must she be groping? must we be groping? must you be groping? must they be groping?
Perfect
must I have groped? must you have groped? must she have groped? must we have groped? must you have groped? must they have groped?
V-ing perfect
must I have been groping? must you have been groping? must she have been groping? must we have been groping? must you have been groping? must they have been groping?
Interro-negative form
Simple form
must I not grope? must you not grope? must she not grope? must we not grope? must you not grope? must they not grope?
V-ing form
must I not be groping? must you not be groping? must she not be groping? must we not be groping? must you not be groping? must they not be groping?
Perfect
must I not have groped? must you not have groped? must she not have groped? must we not have groped? must you not have groped? must they not have groped?
V-ing perfect
must I not have been groping? must you not have been groping? must she not have been groping? must we not have been groping? must you not have been groping? must they not have been groping?