I must sailplane you must sailplane she must sailplane we must sailplane you must sailplane they must sailplane
V-ing form
I must be sailplaning you must be sailplaning she must be sailplaning we must be sailplaning you must be sailplaning they must be sailplaning
Perfect
I must have sailplaned you must have sailplaned she must have sailplaned we must have sailplaned you must have sailplaned they must have sailplaned
V-ing perfect
I must have been sailplaning you must have been sailplaning she must have been sailplaning we must have been sailplaning you must have been sailplaning they must have been sailplaning
Negation
Simple form
I must not sailplane you must not sailplane she must not sailplane we must not sailplane you must not sailplane they must not sailplane
V-ing form
I must not be sailplaning you must not be sailplaning she must not be sailplaning we must not be sailplaning you must not be sailplaning they must not be sailplaning
Perfect
I must not have sailplaned you must not have sailplaned she must not have sailplaned we must not have sailplaned you must not have sailplaned they must not have sailplaned
V-ing perfect
I must not have been sailplaning you must not have been sailplaning she must not have been sailplaning we must not have been sailplaning you must not have been sailplaning they must not have been sailplaning
Interrogative form
Simple form
must I sailplane? must you sailplane? must she sailplane? must we sailplane? must you sailplane? must they sailplane?
V-ing form
must I be sailplaning? must you be sailplaning? must she be sailplaning? must we be sailplaning? must you be sailplaning? must they be sailplaning?
Perfect
must I have sailplaned? must you have sailplaned? must she have sailplaned? must we have sailplaned? must you have sailplaned? must they have sailplaned?
V-ing perfect
must I have been sailplaning? must you have been sailplaning? must she have been sailplaning? must we have been sailplaning? must you have been sailplaning? must they have been sailplaning?
Interro-negative form
Simple form
must I not sailplane? must you not sailplane? must she not sailplane? must we not sailplane? must you not sailplane? must they not sailplane?
V-ing form
must I not be sailplaning? must you not be sailplaning? must she not be sailplaning? must we not be sailplaning? must you not be sailplaning? must they not be sailplaning?
Perfect
must I not have sailplaned? must you not have sailplaned? must she not have sailplaned? must we not have sailplaned? must you not have sailplaned? must they not have sailplaned?
V-ing perfect
must I not have been sailplaning? must you not have been sailplaning? must she not have been sailplaning? must we not have been sailplaning? must you not have been sailplaning? must they not have been sailplaning?