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 must not congregate you must not congregate he must not congregate we must not congregate you must not congregate they must not congregate
V-ing form
I must not be congregating you must not be congregating he must not be congregating we must not be congregating you must not be congregating they must not be congregating
Perfect
I must not have congregated you must not have congregated he must not have congregated we must not have congregated you must not have congregated they must not have congregated
V-ing perfect
I must not have been congregating you must not have been congregating he must not have been congregating we must not have been congregating you must not have been congregating they must not 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
must I not congregate? must you not congregate? must he not congregate? must we not congregate? must you not congregate? must they not congregate?
V-ing form
must I not be congregating? must you not be congregating? must he not be congregating? must we not be congregating? must you not be congregating? must they not be congregating?
Perfect
must I not have congregated? must you not have congregated? must he not have congregated? must we not have congregated? must you not have congregated? must they not have congregated?
V-ing perfect
must I not have been congregating? must you not have been congregating? must he not have been congregating? must we not have been congregating? must you not have been congregating? must they not have been congregating?