must group
Regular verb: group - grouped- grouped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must group
you must group
she must group
we must group
you must group
they must group 	I must be grouping
you must be grouping
she must be grouping
we must be grouping
you must be grouping
they must be grouping	I must have grouped
you must have grouped
she must have grouped
we must have grouped
you must have grouped
they must have grouped	I must have been grouping
you must have been grouping
she must have been grouping
we must have been grouping
you must have been grouping
they must have been grouping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not group
you must not group
she must not group
we must not group
you must not group
they must not group 	I must not be grouping
you must not be grouping
she must not be grouping
we must not be grouping
you must not be grouping
they must not be grouping	I must not have grouped
you must not have grouped
she must not have grouped
we must not have grouped
you must not have grouped
they must not have grouped	I must not have been grouping
you must not have been grouping
she must not have been grouping
we must not have been grouping
you must not have been grouping
they must not have been grouping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I group?
must you group?
must she group?
must we group?
must you group?
must they group? 	must I be grouping?
must you be grouping?
must she be grouping?
must we be grouping?
must you be grouping?
must they be grouping? 	must I have grouped?
must you have grouped?
must she have grouped?
must we have grouped?
must you have grouped?
must they have grouped? 	must I have been grouping?
must you have been grouping?
must she have been grouping?
must we have been grouping?
must you have been grouping?
must they have been grouping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not group?
must you not group?
must she not group?
must we not group?
must you not group?
must they not group? 	must I not be grouping?
must you not be grouping?
must she not be grouping?
must we not be grouping?
must you not be grouping?
must they not be grouping? 	must I not have grouped?
must you not have grouped?
must she not have grouped?
must we not have grouped?
must you not have grouped?
must they not have grouped? 	must I not have been grouping?
must you not have been grouping?
must she not have been grouping?
must we not have been grouping?
must you not have been grouping?
must they not have been grouping?