English verb conjugation
SHOULD BASE

Regular verb: base - based - based

Affirmation

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