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