English verb conjugation
SHOULD REFER

Regular verb: refer - referred - referred

Affirmation

Simple form	V-ing form
I should refer you should refer he should refer we should refer you should refer they should refer	I should be referring you should be referring he should be referring we should be referring you should be referring they should be referring
Perfect	V-ing perfect
I should have referred you should have referred he should have referred we should have referred you should have referred they should have referred	I should have been referring you should have been referring he should have been referring we should have been referring you should have been referring they should have been referring

Negation

Simple form	V-ing form
I should not refer you should not refer he should not refer we should not refer you should not refer they should not refer	I should not be referring you should not be referring he should not be referring we should not be referring you should not be referring they should not be referring
Perfect	V-ing perfect
I should not have referred you should not have referred he should not have referred we should not have referred you should not have referred they should not have referred	I should not have been referring you should not have been referring he should not have been referring we should not have been referring you should not have been referring they should not have been referring

Interrogative form

Simple form	V-ing form
should I refer? should you refer? should he refer? should we refer? should you refer? should they refer?	should I be referring? should you be referring? should he be referring? should we be referring? should you be referring? should they be referring?
Perfect	V-ing perfect
should I have referred? should you have referred? should he have referred? should we have referred? should you have referred? should they have referred?	should I have been referring? should you have been referring? should he have been referring? should we have been referring? should you have been referring? should they have been referring?

Interro-negative form

Simple form	V-ing form
should I not refer? should you not refer? should he not refer? should we not refer? should you not refer? should they not refer?	should I not be referring? should you not be referring? should he not be referring? should we not be referring? should you not be referring? should they not be referring?
Perfect	V-ing perfect
should I not have referred? should you not have referred? should he not have referred? should we not have referred? should you not have referred? should they not have referred?	should I not have been referring? should you not have been referring? should he not have been referring? should we not have been referring? should you not have been referring? should they not have been referring?