should refer
Verbo regular: refer - referred- referred

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should refer
you should refer
she should refer
we should refer
you should refer
they should refer 	I should be referring
you should be referring
she should be referring
we should be referring
you should be referring
they should be referring	I should have referred
you should have referred
she 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
she should have been referring
we should have been referring
you should have been referring
they should have been referring	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not refer
you should not refer
she 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
she should not be referring
we should not be referring
you should not be referring
they should not be referring	I should not have referred
you should not have referred
she 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
she should not have been referring
we should not have been referring
you should not have been referring
they should not have been referring	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I refer?
should you refer?
should she refer?
should we refer?
should you refer?
should they refer? 	should I be referring?
should you be referring?
should she be referring?
should we be referring?
should you be referring?
should they be referring? 	should I have referred?
should you have referred?
should she 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 she have been referring?
should we have been referring?
should you have been referring?
should they have been referring? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not refer?
should you not refer?
should she 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 she not be referring?
should we not be referring?
should you not be referring?
should they not be referring? 	should I not have referred?
should you not have referred?
should she 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 she not have been referring?
should we not have been referring?
should you not have been referring?
should they not have been referring?