must congregate
Regular verb: congregate - congregated- congregated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must congregate
you must congregate
she must congregate
we must congregate
you must congregate
they must congregate 	I must be congregating
you must be congregating
she must be congregating
we must be congregating
you must be congregating
they must be congregating	I must have congregated
you must have congregated
she must have congregated
we must have congregated
you must have congregated
they must have congregated	I must have been congregating
you must have been congregating
she must have been congregating
we must have been congregating
you must have been congregating
they must have been congregating	

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

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