I must communicate you must communicate she must communicate we must communicate you must communicate they must communicate
V-ing form
I must be communicating you must be communicating she must be communicating we must be communicating you must be communicating they must be communicating
Perfect
I must have communicated you must have communicated she 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 she 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 she 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 she 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 she 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 she 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 she communicate? must we communicate? must you communicate? must they communicate?
V-ing form
must I be communicating? must you be communicating? must she be communicating? must we be communicating? must you be communicating? must they be communicating?
Perfect
must I have communicated? must you have communicated? must she 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 she 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 she 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 she 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 she 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 she have been communicating? mustn't we have been communicating? mustn't you have been communicating? mustn't they have been communicating?