should yack
Verbo regular: yack - yacked- yacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should yack
you should yack
he should yack
we should yack
you should yack
they should yack 	I should be yacking
you should be yacking
he should be yacking
we should be yacking
you should be yacking
they should be yacking	I should have yacked
you should have yacked
he should have yacked
we should have yacked
you should have yacked
they should have yacked	I should have been yacking
you should have been yacking
he should have been yacking
we should have been yacking
you should have been yacking
they should have been yacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not yack
you should not yack
he should not yack
we should not yack
you should not yack
they should not yack 	I should not be yacking
you should not be yacking
he should not be yacking
we should not be yacking
you should not be yacking
they should not be yacking	I should not have yacked
you should not have yacked
he should not have yacked
we should not have yacked
you should not have yacked
they should not have yacked	I should not have been yacking
you should not have been yacking
he should not have been yacking
we should not have been yacking
you should not have been yacking
they should not have been yacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I yack?
should you yack?
should he yack?
should we yack?
should you yack?
should they yack? 	should I be yacking?
should you be yacking?
should he be yacking?
should we be yacking?
should you be yacking?
should they be yacking? 	should I have yacked?
should you have yacked?
should he have yacked?
should we have yacked?
should you have yacked?
should they have yacked? 	should I have been yacking?
should you have been yacking?
should he have been yacking?
should we have been yacking?
should you have been yacking?
should they have been yacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not yack?
should you not yack?
should he not yack?
should we not yack?
should you not yack?
should they not yack? 	should I not be yacking?
should you not be yacking?
should he not be yacking?
should we not be yacking?
should you not be yacking?
should they not be yacking? 	should I not have yacked?
should you not have yacked?
should he not have yacked?
should we not have yacked?
should you not have yacked?
should they not have yacked? 	should I not have been yacking?
should you not have been yacking?
should he not have been yacking?
should we not have been yacking?
should you not have been yacking?
should they not have been yacking?