should strengthen
Verbo regular: strengthen - strengthened- strengthened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd strengthen
you'd strengthen
he'd strengthen
we'd strengthen
you'd strengthen
they'd strengthen 	I'd be strengthening
you'd be strengthening
he'd be strengthening
we'd be strengthening
you'd be strengthening
they'd be strengthening	I should've strengthened
you should've strengthened
he should've strengthened
we should've strengthened
you should've strengthened
they should've strengthened	I should've been strengthening
you should've been strengthening
he should've been strengthening
we should've been strengthening
you should've been strengthening
they should've been strengthening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't strengthen
you shouldn't strengthen
he shouldn't strengthen
we shouldn't strengthen
you shouldn't strengthen
they shouldn't strengthen 	I shouldn't be strengthening
you shouldn't be strengthening
he shouldn't be strengthening
we shouldn't be strengthening
you shouldn't be strengthening
they shouldn't be strengthening	I shouldn't have strengthened
you shouldn't have strengthened
he shouldn't have strengthened
we shouldn't have strengthened
you shouldn't have strengthened
they shouldn't have strengthened	I shouldn't have been strengthening
you shouldn't have been strengthening
he shouldn't have been strengthening
we shouldn't have been strengthening
you shouldn't have been strengthening
they shouldn't have been strengthening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I strengthen?
should you strengthen?
should he strengthen?
should we strengthen?
should you strengthen?
should they strengthen? 	should I be strengthening?
should you be strengthening?
should he be strengthening?
should we be strengthening?
should you be strengthening?
should they be strengthening? 	should I have strengthened?
should you have strengthened?
should he have strengthened?
should we have strengthened?
should you have strengthened?
should they have strengthened? 	should I have been strengthening?
should you have been strengthening?
should he have been strengthening?
should we have been strengthening?
should you have been strengthening?
should they have been strengthening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
shouldn't I strengthen?
shouldn't you strengthen?
shouldn't he strengthen?
shouldn't we strengthen?
shouldn't you strengthen?
shouldn't they strengthen? 	shouldn't I be strengthening?
shouldn't you be strengthening?
shouldn't he be strengthening?
shouldn't we be strengthening?
shouldn't you be strengthening?
shouldn't they be strengthening? 	shouldn't I have strengthened?
shouldn't you have strengthened?
shouldn't he have strengthened?
shouldn't we have strengthened?
shouldn't you have strengthened?
shouldn't they have strengthened? 	shouldn't I have been strengthening?
shouldn't you have been strengthening?
shouldn't he have been strengthening?
shouldn't we have been strengthening?
shouldn't you have been strengthening?
shouldn't they have been strengthening?