should sum
Verbo regular: sum - summed- summed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should sum
you should sum
she should sum
we should sum
you should sum
they should sum 	I should be summing
you should be summing
she should be summing
we should be summing
you should be summing
they should be summing	I should have summed
you should have summed
she should have summed
we should have summed
you should have summed
they should have summed	I should have been summing
you should have been summing
she should have been summing
we should have been summing
you should have been summing
they should have been summing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not sum
you should not sum
she should not sum
we should not sum
you should not sum
they should not sum 	I should not be summing
you should not be summing
she should not be summing
we should not be summing
you should not be summing
they should not be summing	I should not have summed
you should not have summed
she should not have summed
we should not have summed
you should not have summed
they should not have summed	I should not have been summing
you should not have been summing
she should not have been summing
we should not have been summing
you should not have been summing
they should not have been summing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I sum?
should you sum?
should she sum?
should we sum?
should you sum?
should they sum? 	should I be summing?
should you be summing?
should she be summing?
should we be summing?
should you be summing?
should they be summing? 	should I have summed?
should you have summed?
should she have summed?
should we have summed?
should you have summed?
should they have summed? 	should I have been summing?
should you have been summing?
should she have been summing?
should we have been summing?
should you have been summing?
should they have been summing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not sum?
should you not sum?
should she not sum?
should we not sum?
should you not sum?
should they not sum? 	should I not be summing?
should you not be summing?
should she not be summing?
should we not be summing?
should you not be summing?
should they not be summing? 	should I not have summed?
should you not have summed?
should she not have summed?
should we not have summed?
should you not have summed?
should they not have summed? 	should I not have been summing?
should you not have been summing?
should she not have been summing?
should we not have been summing?
should you not have been summing?
should they not have been summing?