should combine
Regular verb: combine - combined- combined

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd combine
you'd combine
she'd combine
we'd combine
you'd combine
they'd combine 	I'd be combining
you'd be combining
she'd be combining
we'd be combining
you'd be combining
they'd be combining	I should've combined
you should've combined
she should've combined
we should've combined
you should've combined
they should've combined	I should've been combining
you should've been combining
she should've been combining
we should've been combining
you should've been combining
they should've been combining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't combine
you shouldn't combine
she shouldn't combine
we shouldn't combine
you shouldn't combine
they shouldn't combine 	I shouldn't be combining
you shouldn't be combining
she shouldn't be combining
we shouldn't be combining
you shouldn't be combining
they shouldn't be combining	I shouldn't have combined
you shouldn't have combined
she shouldn't have combined
we shouldn't have combined
you shouldn't have combined
they shouldn't have combined	I shouldn't have been combining
you shouldn't have been combining
she shouldn't have been combining
we shouldn't have been combining
you shouldn't have been combining
they shouldn't have been combining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I combine?
should you combine?
should she combine?
should we combine?
should you combine?
should they combine? 	should I be combining?
should you be combining?
should she be combining?
should we be combining?
should you be combining?
should they be combining? 	should I have combined?
should you have combined?
should she have combined?
should we have combined?
should you have combined?
should they have combined? 	should I have been combining?
should you have been combining?
should she have been combining?
should we have been combining?
should you have been combining?
should they have been combining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I combine?
shouldn't you combine?
shouldn't she combine?
shouldn't we combine?
shouldn't you combine?
shouldn't they combine? 	shouldn't I be combining?
shouldn't you be combining?
shouldn't she be combining?
shouldn't we be combining?
shouldn't you be combining?
shouldn't they be combining? 	shouldn't I have combined?
shouldn't you have combined?
shouldn't she have combined?
shouldn't we have combined?
shouldn't you have combined?
shouldn't they have combined? 	shouldn't I have been combining?
shouldn't you have been combining?
shouldn't she have been combining?
shouldn't we have been combining?
shouldn't you have been combining?
shouldn't they have been combining?