should understand
Verbo irregular: understand - understood- understood

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd understand
you'd understand
he'd understand
we'd understand
you'd understand
they'd understand 	I'd be understanding
you'd be understanding
he'd be understanding
we'd be understanding
you'd be understanding
they'd be understanding	I should've understood
you should've understood
he should've understood
we should've understood
you should've understood
they should've understood	I should've been understanding
you should've been understanding
he should've been understanding
we should've been understanding
you should've been understanding
they should've been understanding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't understand
you shouldn't understand
he shouldn't understand
we shouldn't understand
you shouldn't understand
they shouldn't understand 	I shouldn't be understanding
you shouldn't be understanding
he shouldn't be understanding
we shouldn't be understanding
you shouldn't be understanding
they shouldn't be understanding	I shouldn't have understood
you shouldn't have understood
he shouldn't have understood
we shouldn't have understood
you shouldn't have understood
they shouldn't have understood	I shouldn't have been understanding
you shouldn't have been understanding
he shouldn't have been understanding
we shouldn't have been understanding
you shouldn't have been understanding
they shouldn't have been understanding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I understand?
should you understand?
should he understand?
should we understand?
should you understand?
should they understand? 	should I be understanding?
should you be understanding?
should he be understanding?
should we be understanding?
should you be understanding?
should they be understanding? 	should I have understood?
should you have understood?
should he have understood?
should we have understood?
should you have understood?
should they have understood? 	should I have been understanding?
should you have been understanding?
should he have been understanding?
should we have been understanding?
should you have been understanding?
should they have been understanding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
shouldn't I understand?
shouldn't you understand?
shouldn't he understand?
shouldn't we understand?
shouldn't you understand?
shouldn't they understand? 	shouldn't I be understanding?
shouldn't you be understanding?
shouldn't he be understanding?
shouldn't we be understanding?
shouldn't you be understanding?
shouldn't they be understanding? 	shouldn't I have understood?
shouldn't you have understood?
shouldn't he have understood?
shouldn't we have understood?
shouldn't you have understood?
shouldn't they have understood? 	shouldn't I have been understanding?
shouldn't you have been understanding?
shouldn't he have been understanding?
shouldn't we have been understanding?
shouldn't you have been understanding?
shouldn't they have been understanding?