I must encase you must encase she must encase we must encase you must encase they must encase
V-ing form
I must be encasing you must be encasing she must be encasing we must be encasing you must be encasing they must be encasing
Perfect
I must have encased you must have encased she must have encased we must have encased you must have encased they must have encased
V-ing perfect
I must have been encasing you must have been encasing she must have been encasing we must have been encasing you must have been encasing they must have been encasing
Negation
Simple form
I must not encase you must not encase she must not encase we must not encase you must not encase they must not encase
V-ing form
I must not be encasing you must not be encasing she must not be encasing we must not be encasing you must not be encasing they must not be encasing
Perfect
I must not have encased you must not have encased she must not have encased we must not have encased you must not have encased they must not have encased
V-ing perfect
I must not have been encasing you must not have been encasing she must not have been encasing we must not have been encasing you must not have been encasing they must not have been encasing
Interrogative form
Simple form
must I encase? must you encase? must she encase? must we encase? must you encase? must they encase?
V-ing form
must I be encasing? must you be encasing? must she be encasing? must we be encasing? must you be encasing? must they be encasing?
Perfect
must I have encased? must you have encased? must she have encased? must we have encased? must you have encased? must they have encased?
V-ing perfect
must I have been encasing? must you have been encasing? must she have been encasing? must we have been encasing? must you have been encasing? must they have been encasing?
Interro-negative form
Simple form
must I not encase? must you not encase? must she not encase? must we not encase? must you not encase? must they not encase?
V-ing form
must I not be encasing? must you not be encasing? must she not be encasing? must we not be encasing? must you not be encasing? must they not be encasing?
Perfect
must I not have encased? must you not have encased? must she not have encased? must we not have encased? must you not have encased? must they not have encased?
V-ing perfect
must I not have been encasing? must you not have been encasing? must she not have been encasing? must we not have been encasing? must you not have been encasing? must they not have been encasing?