I must skewer you must skewer she must skewer we must skewer you must skewer they must skewer
V-ing form
I must be skewering you must be skewering she must be skewering we must be skewering you must be skewering they must be skewering
Perfect
I must have skewered you must have skewered she must have skewered we must have skewered you must have skewered they must have skewered
V-ing perfect
I must have been skewering you must have been skewering she must have been skewering we must have been skewering you must have been skewering they must have been skewering
Negation
Simple form
I mustn't skewer you mustn't skewer she mustn't skewer we mustn't skewer you mustn't skewer they mustn't skewer
V-ing form
I mustn't be skewering you mustn't be skewering she mustn't be skewering we mustn't be skewering you mustn't be skewering they mustn't be skewering
Perfect
I mustn't have skewered you mustn't have skewered she mustn't have skewered we mustn't have skewered you mustn't have skewered they mustn't have skewered
V-ing perfect
I mustn't have been skewering you mustn't have been skewering she mustn't have been skewering we mustn't have been skewering you mustn't have been skewering they mustn't have been skewering
Interrogative form
Simple form
must I skewer? must you skewer? must she skewer? must we skewer? must you skewer? must they skewer?
V-ing form
must I be skewering? must you be skewering? must she be skewering? must we be skewering? must you be skewering? must they be skewering?
Perfect
must I have skewered? must you have skewered? must she have skewered? must we have skewered? must you have skewered? must they have skewered?
V-ing perfect
must I have been skewering? must you have been skewering? must she have been skewering? must we have been skewering? must you have been skewering? must they have been skewering?
Interro-negative form
Simple form
mustn't I skewer? mustn't you skewer? mustn't she skewer? mustn't we skewer? mustn't you skewer? mustn't they skewer?
V-ing form
mustn't I be skewering? mustn't you be skewering? mustn't she be skewering? mustn't we be skewering? mustn't you be skewering? mustn't they be skewering?
Perfect
mustn't I have skewered? mustn't you have skewered? mustn't she have skewered? mustn't we have skewered? mustn't you have skewered? mustn't they have skewered?
V-ing perfect
mustn't I have been skewering? mustn't you have been skewering? mustn't she have been skewering? mustn't we have been skewering? mustn't you have been skewering? mustn't they have been skewering?