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