should base
Regular verb: base - based- based

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I should not base
you should not base
she should not base
we should not base
you should not base
they should not base 	I should not be basing
you should not be basing
she should not be basing
we should not be basing
you should not be basing
they should not be basing	I should not have based
you should not have based
she should not have based
we should not have based
you should not have based
they should not have based	I should not have been basing
you should not have been basing
she should not have been basing
we should not have been basing
you should not have been basing
they should not 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 	
should I not base?
should you not base?
should she not base?
should we not base?
should you not base?
should they not base? 	should I not be basing?
should you not be basing?
should she not be basing?
should we not be basing?
should you not be basing?
should they not be basing? 	should I not have based?
should you not have based?
should she not have based?
should we not have based?
should you not have based?
should they not have based? 	should I not have been basing?
should you not have been basing?
should she not have been basing?
should we not have been basing?
should you not have been basing?
should they not have been basing?