I must flank you must flank she must flank we must flank you must flank they must flank
V-ing form
I must be flanking you must be flanking she must be flanking we must be flanking you must be flanking they must be flanking
Perfect
I must have flanked you must have flanked she must have flanked we must have flanked you must have flanked they must have flanked
V-ing perfect
I must have been flanking you must have been flanking she must have been flanking we must have been flanking you must have been flanking they must have been flanking
Negation
Simple form
I must not flank you must not flank she must not flank we must not flank you must not flank they must not flank
V-ing form
I must not be flanking you must not be flanking she must not be flanking we must not be flanking you must not be flanking they must not be flanking
Perfect
I must not have flanked you must not have flanked she must not have flanked we must not have flanked you must not have flanked they must not have flanked
V-ing perfect
I must not have been flanking you must not have been flanking she must not have been flanking we must not have been flanking you must not have been flanking they must not have been flanking
Interrogative form
Simple form
must I flank? must you flank? must she flank? must we flank? must you flank? must they flank?
V-ing form
must I be flanking? must you be flanking? must she be flanking? must we be flanking? must you be flanking? must they be flanking?
Perfect
must I have flanked? must you have flanked? must she have flanked? must we have flanked? must you have flanked? must they have flanked?
V-ing perfect
must I have been flanking? must you have been flanking? must she have been flanking? must we have been flanking? must you have been flanking? must they have been flanking?
Interro-negative form
Simple form
must I not flank? must you not flank? must she not flank? must we not flank? must you not flank? must they not flank?
V-ing form
must I not be flanking? must you not be flanking? must she not be flanking? must we not be flanking? must you not be flanking? must they not be flanking?
Perfect
must I not have flanked? must you not have flanked? must she not have flanked? must we not have flanked? must you not have flanked? must they not have flanked?
V-ing perfect
must I not have been flanking? must you not have been flanking? must she not have been flanking? must we not have been flanking? must you not have been flanking? must they not have been flanking?