I must half-mast you must half-mast she must half-mast we must half-mast you must half-mast they must half-mast
V-ing form
I must be half-masting you must be half-masting she must be half-masting we must be half-masting you must be half-masting they must be half-masting
Perfect
I must have half-masted you must have half-masted she must have half-masted we must have half-masted you must have half-masted they must have half-masted
V-ing perfect
I must have been half-masting you must have been half-masting she must have been half-masting we must have been half-masting you must have been half-masting they must have been half-masting
Negation
Simple form
I must not half-mast you must not half-mast she must not half-mast we must not half-mast you must not half-mast they must not half-mast
V-ing form
I must not be half-masting you must not be half-masting she must not be half-masting we must not be half-masting you must not be half-masting they must not be half-masting
Perfect
I must not have half-masted you must not have half-masted she must not have half-masted we must not have half-masted you must not have half-masted they must not have half-masted
V-ing perfect
I must not have been half-masting you must not have been half-masting she must not have been half-masting we must not have been half-masting you must not have been half-masting they must not have been half-masting
Interrogative form
Simple form
must I half-mast? must you half-mast? must she half-mast? must we half-mast? must you half-mast? must they half-mast?
V-ing form
must I be half-masting? must you be half-masting? must she be half-masting? must we be half-masting? must you be half-masting? must they be half-masting?
Perfect
must I have half-masted? must you have half-masted? must she have half-masted? must we have half-masted? must you have half-masted? must they have half-masted?
V-ing perfect
must I have been half-masting? must you have been half-masting? must she have been half-masting? must we have been half-masting? must you have been half-masting? must they have been half-masting?
Interro-negative form
Simple form
must I not half-mast? must you not half-mast? must she not half-mast? must we not half-mast? must you not half-mast? must they not half-mast?
V-ing form
must I not be half-masting? must you not be half-masting? must she not be half-masting? must we not be half-masting? must you not be half-masting? must they not be half-masting?
Perfect
must I not have half-masted? must you not have half-masted? must she not have half-masted? must we not have half-masted? must you not have half-masted? must they not have half-masted?
V-ing perfect
must I not have been half-masting? must you not have been half-masting? must she not have been half-masting? must we not have been half-masting? must you not have been half-masting? must they not have been half-masting?