should abstain
Verbo regular: abstain - abstained- abstained

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should abstain
you should abstain
he should abstain
we should abstain
you should abstain
they should abstain 	I should be abstaining
you should be abstaining
he should be abstaining
we should be abstaining
you should be abstaining
they should be abstaining	I should have abstained
you should have abstained
he should have abstained
we should have abstained
you should have abstained
they should have abstained	I should have been abstaining
you should have been abstaining
he should have been abstaining
we should have been abstaining
you should have been abstaining
they should have been abstaining	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not abstain
you should not abstain
he should not abstain
we should not abstain
you should not abstain
they should not abstain 	I should not be abstaining
you should not be abstaining
he should not be abstaining
we should not be abstaining
you should not be abstaining
they should not be abstaining	I should not have abstained
you should not have abstained
he should not have abstained
we should not have abstained
you should not have abstained
they should not have abstained	I should not have been abstaining
you should not have been abstaining
he should not have been abstaining
we should not have been abstaining
you should not have been abstaining
they should not have been abstaining	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I abstain?
should you abstain?
should he abstain?
should we abstain?
should you abstain?
should they abstain? 	should I be abstaining?
should you be abstaining?
should he be abstaining?
should we be abstaining?
should you be abstaining?
should they be abstaining? 	should I have abstained?
should you have abstained?
should he have abstained?
should we have abstained?
should you have abstained?
should they have abstained? 	should I have been abstaining?
should you have been abstaining?
should he have been abstaining?
should we have been abstaining?
should you have been abstaining?
should they have been abstaining? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not abstain?
should you not abstain?
should he not abstain?
should we not abstain?
should you not abstain?
should they not abstain? 	should I not be abstaining?
should you not be abstaining?
should he not be abstaining?
should we not be abstaining?
should you not be abstaining?
should they not be abstaining? 	should I not have abstained?
should you not have abstained?
should he not have abstained?
should we not have abstained?
should you not have abstained?
should they not have abstained? 	should I not have been abstaining?
should you not have been abstaining?
should he not have been abstaining?
should we not have been abstaining?
should you not have been abstaining?
should they not have been abstaining?