should base
Regular verb: base - based- based

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd base
you'd base
she'd base
we'd base
you'd base
they'd base 	I'd be basing
you'd be basing
she'd be basing
we'd be basing
you'd be basing
they'd be basing	I should've based
you should've based
she should've based
we should've based
you should've based
they should've based	I should've been basing
you should've been basing
she should've been basing
we should've been basing
you should've been basing
they should've been basing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't base
you shouldn't base
she shouldn't base
we shouldn't base
you shouldn't base
they shouldn't base 	I shouldn't be basing
you shouldn't be basing
she shouldn't be basing
we shouldn't be basing
you shouldn't be basing
they shouldn't be basing	I shouldn't have based
you shouldn't have based
she shouldn't have based
we shouldn't have based
you shouldn't have based
they shouldn't have based	I shouldn't have been basing
you shouldn't have been basing
she shouldn't have been basing
we shouldn't have been basing
you shouldn't have been basing
they shouldn't have been basing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I base?
should you base?
should she base?
should we base?
should you base?
should they base? 	should I be basing?
should you be basing?
should she be basing?
should we be basing?
should you be basing?
should they be basing? 	should I have based?
should you have based?
should she have based?
should we have based?
should you have based?
should they have based? 	should I have been basing?
should you have been basing?
should she have been basing?
should we have been basing?
should you have been basing?
should they have been basing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I base?
shouldn't you base?
shouldn't she base?
shouldn't we base?
shouldn't you base?
shouldn't they base? 	shouldn't I be basing?
shouldn't you be basing?
shouldn't she be basing?
shouldn't we be basing?
shouldn't you be basing?
shouldn't they be basing? 	shouldn't I have based?
shouldn't you have based?
shouldn't she have based?
shouldn't we have based?
shouldn't you have based?
shouldn't they have based? 	shouldn't I have been basing?
shouldn't you have been basing?
shouldn't she have been basing?
shouldn't we have been basing?
shouldn't you have been basing?
shouldn't they have been basing?