I must tuck you must tuck she must tuck we must tuck you must tuck they must tuck
V-ing form
I must be tucking you must be tucking she must be tucking we must be tucking you must be tucking they must be tucking
Perfect
I must have tucked you must have tucked she must have tucked we must have tucked you must have tucked they must have tucked
V-ing perfect
I must have been tucking you must have been tucking she must have been tucking we must have been tucking you must have been tucking they must have been tucking
Negation
Simple form
I must not tuck you must not tuck she must not tuck we must not tuck you must not tuck they must not tuck
V-ing form
I must not be tucking you must not be tucking she must not be tucking we must not be tucking you must not be tucking they must not be tucking
Perfect
I must not have tucked you must not have tucked she must not have tucked we must not have tucked you must not have tucked they must not have tucked
V-ing perfect
I must not have been tucking you must not have been tucking she must not have been tucking we must not have been tucking you must not have been tucking they must not have been tucking
Interrogative form
Simple form
must I tuck? must you tuck? must she tuck? must we tuck? must you tuck? must they tuck?
V-ing form
must I be tucking? must you be tucking? must she be tucking? must we be tucking? must you be tucking? must they be tucking?
Perfect
must I have tucked? must you have tucked? must she have tucked? must we have tucked? must you have tucked? must they have tucked?
V-ing perfect
must I have been tucking? must you have been tucking? must she have been tucking? must we have been tucking? must you have been tucking? must they have been tucking?
Interro-negative form
Simple form
must I not tuck? must you not tuck? must she not tuck? must we not tuck? must you not tuck? must they not tuck?
V-ing form
must I not be tucking? must you not be tucking? must she not be tucking? must we not be tucking? must you not be tucking? must they not be tucking?
Perfect
must I not have tucked? must you not have tucked? must she not have tucked? must we not have tucked? must you not have tucked? must they not have tucked?
V-ing perfect
must I not have been tucking? must you not have been tucking? must she not have been tucking? must we not have been tucking? must you not have been tucking? must they not have been tucking?