should understudy
Verbo regular: understudy - understudied- understudied

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I'd understudy
you'd understudy
he'd understudy
we'd understudy
you'd understudy
they'd understudy 	I'd be understudying
you'd be understudying
he'd be understudying
we'd be understudying
you'd be understudying
they'd be understudying	I should've understudied
you should've understudied
he should've understudied
we should've understudied
you should've understudied
they should've understudied	I should've been understudying
you should've been understudying
he should've been understudying
we should've been understudying
you should've been understudying
they should've been understudying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I shouldn't understudy
you shouldn't understudy
he shouldn't understudy
we shouldn't understudy
you shouldn't understudy
they shouldn't understudy 	I shouldn't be understudying
you shouldn't be understudying
he shouldn't be understudying
we shouldn't be understudying
you shouldn't be understudying
they shouldn't be understudying	I shouldn't have understudied
you shouldn't have understudied
he shouldn't have understudied
we shouldn't have understudied
you shouldn't have understudied
they shouldn't have understudied	I shouldn't have been understudying
you shouldn't have been understudying
he shouldn't have been understudying
we shouldn't have been understudying
you shouldn't have been understudying
they shouldn't have been understudying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
should I understudy?
should you understudy?
should he understudy?
should we understudy?
should you understudy?
should they understudy? 	should I be understudying?
should you be understudying?
should he be understudying?
should we be understudying?
should you be understudying?
should they be understudying? 	should I have understudied?
should you have understudied?
should he have understudied?
should we have understudied?
should you have understudied?
should they have understudied? 	should I have been understudying?
should you have been understudying?
should he have been understudying?
should we have been understudying?
should you have been understudying?
should they have been understudying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
shouldn't I understudy?
shouldn't you understudy?
shouldn't he understudy?
shouldn't we understudy?
shouldn't you understudy?
shouldn't they understudy? 	shouldn't I be understudying?
shouldn't you be understudying?
shouldn't he be understudying?
shouldn't we be understudying?
shouldn't you be understudying?
shouldn't they be understudying? 	shouldn't I have understudied?
shouldn't you have understudied?
shouldn't he have understudied?
shouldn't we have understudied?
shouldn't you have understudied?
shouldn't they have understudied? 	shouldn't I have been understudying?
shouldn't you have been understudying?
shouldn't he have been understudying?
shouldn't we have been understudying?
shouldn't you have been understudying?
shouldn't they have been understudying?