should letter
Verbo regular: letter - lettered- lettered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should letter
you should letter
he should letter
we should letter
you should letter
they should letter 	I should be lettering
you should be lettering
he should be lettering
we should be lettering
you should be lettering
they should be lettering	I should have lettered
you should have lettered
he should have lettered
we should have lettered
you should have lettered
they should have lettered	I should have been lettering
you should have been lettering
he should have been lettering
we should have been lettering
you should have been lettering
they should have been lettering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I should not letter
you should not letter
he should not letter
we should not letter
you should not letter
they should not letter 	I should not be lettering
you should not be lettering
he should not be lettering
we should not be lettering
you should not be lettering
they should not be lettering	I should not have lettered
you should not have lettered
he should not have lettered
we should not have lettered
you should not have lettered
they should not have lettered	I should not have been lettering
you should not have been lettering
he should not have been lettering
we should not have been lettering
you should not have been lettering
they should not have been lettering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I letter?
should you letter?
should he letter?
should we letter?
should you letter?
should they letter? 	should I be lettering?
should you be lettering?
should he be lettering?
should we be lettering?
should you be lettering?
should they be lettering? 	should I have lettered?
should you have lettered?
should he have lettered?
should we have lettered?
should you have lettered?
should they have lettered? 	should I have been lettering?
should you have been lettering?
should he have been lettering?
should we have been lettering?
should you have been lettering?
should they have been lettering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I not letter?
should you not letter?
should he not letter?
should we not letter?
should you not letter?
should they not letter? 	should I not be lettering?
should you not be lettering?
should he not be lettering?
should we not be lettering?
should you not be lettering?
should they not be lettering? 	should I not have lettered?
should you not have lettered?
should he not have lettered?
should we not have lettered?
should you not have lettered?
should they not have lettered? 	should I not have been lettering?
should you not have been lettering?
should he not have been lettering?
should we not have been lettering?
should you not have been lettering?
should they not have been lettering?