should group
Regular verb: group - grouped- grouped

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

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

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

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