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