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