I must spread you must spread he must spread we must spread you must spread they must spread
V-ing form
I must be spreading you must be spreading he must be spreading we must be spreading you must be spreading they must be spreading
Perfect
I must have spread you must have spread he must have spread we must have spread you must have spread they must have spread
V-ing perfect
I must have been spreading you must have been spreading he must have been spreading we must have been spreading you must have been spreading they must have been spreading
Negation
Simple form
I mustn't spread you mustn't spread he mustn't spread we mustn't spread you mustn't spread they mustn't spread
V-ing form
I mustn't be spreading you mustn't be spreading he mustn't be spreading we mustn't be spreading you mustn't be spreading they mustn't be spreading
Perfect
I mustn't have spread you mustn't have spread he mustn't have spread we mustn't have spread you mustn't have spread they mustn't have spread
V-ing perfect
I mustn't have been spreading you mustn't have been spreading he mustn't have been spreading we mustn't have been spreading you mustn't have been spreading they mustn't have been spreading
Interrogative form
Simple form
must I spread? must you spread? must he spread? must we spread? must you spread? must they spread?
V-ing form
must I be spreading? must you be spreading? must he be spreading? must we be spreading? must you be spreading? must they be spreading?
Perfect
must I have spread? must you have spread? must he have spread? must we have spread? must you have spread? must they have spread?
V-ing perfect
must I have been spreading? must you have been spreading? must he have been spreading? must we have been spreading? must you have been spreading? must they have been spreading?
Interro-negative form
Simple form
mustn't I spread? mustn't you spread? mustn't he spread? mustn't we spread? mustn't you spread? mustn't they spread?
V-ing form
mustn't I be spreading? mustn't you be spreading? mustn't he be spreading? mustn't we be spreading? mustn't you be spreading? mustn't they be spreading?
Perfect
mustn't I have spread? mustn't you have spread? mustn't he have spread? mustn't we have spread? mustn't you have spread? mustn't they have spread?
V-ing perfect
mustn't I have been spreading? mustn't you have been spreading? mustn't he have been spreading? mustn't we have been spreading? mustn't you have been spreading? mustn't they have been spreading?