should compare
Regular verb: compare - compared- compared

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd compare
you'd compare
she'd compare
we'd compare
you'd compare
they'd compare 	I'd be comparing
you'd be comparing
she'd be comparing
we'd be comparing
you'd be comparing
they'd be comparing	I should've compared
you should've compared
she should've compared
we should've compared
you should've compared
they should've compared	I should've been comparing
you should've been comparing
she should've been comparing
we should've been comparing
you should've been comparing
they should've been comparing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't compare
you shouldn't compare
she shouldn't compare
we shouldn't compare
you shouldn't compare
they shouldn't compare 	I shouldn't be comparing
you shouldn't be comparing
she shouldn't be comparing
we shouldn't be comparing
you shouldn't be comparing
they shouldn't be comparing	I shouldn't have compared
you shouldn't have compared
she shouldn't have compared
we shouldn't have compared
you shouldn't have compared
they shouldn't have compared	I shouldn't have been comparing
you shouldn't have been comparing
she shouldn't have been comparing
we shouldn't have been comparing
you shouldn't have been comparing
they shouldn't have been comparing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I compare?
should you compare?
should she compare?
should we compare?
should you compare?
should they compare? 	should I be comparing?
should you be comparing?
should she be comparing?
should we be comparing?
should you be comparing?
should they be comparing? 	should I have compared?
should you have compared?
should she have compared?
should we have compared?
should you have compared?
should they have compared? 	should I have been comparing?
should you have been comparing?
should she have been comparing?
should we have been comparing?
should you have been comparing?
should they have been comparing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I compare?
shouldn't you compare?
shouldn't she compare?
shouldn't we compare?
shouldn't you compare?
shouldn't they compare? 	shouldn't I be comparing?
shouldn't you be comparing?
shouldn't she be comparing?
shouldn't we be comparing?
shouldn't you be comparing?
shouldn't they be comparing? 	shouldn't I have compared?
shouldn't you have compared?
shouldn't she have compared?
shouldn't we have compared?
shouldn't you have compared?
shouldn't they have compared? 	shouldn't I have been comparing?
shouldn't you have been comparing?
shouldn't she have been comparing?
shouldn't we have been comparing?
shouldn't you have been comparing?
shouldn't they have been comparing?