should underpin
Verbo regular: underpin - underpinned- underpinned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should underpin
you should underpin
he should underpin
we should underpin
you should underpin
they should underpin 	I should be underpinning
you should be underpinning
he should be underpinning
we should be underpinning
you should be underpinning
they should be underpinning	I should have underpinned
you should have underpinned
he should have underpinned
we should have underpinned
you should have underpinned
they should have underpinned	I should have been underpinning
you should have been underpinning
he should have been underpinning
we should have been underpinning
you should have been underpinning
they should have been underpinning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I should not underpin
you should not underpin
he should not underpin
we should not underpin
you should not underpin
they should not underpin 	I should not be underpinning
you should not be underpinning
he should not be underpinning
we should not be underpinning
you should not be underpinning
they should not be underpinning	I should not have underpinned
you should not have underpinned
he should not have underpinned
we should not have underpinned
you should not have underpinned
they should not have underpinned	I should not have been underpinning
you should not have been underpinning
he should not have been underpinning
we should not have been underpinning
you should not have been underpinning
they should not have been underpinning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I underpin?
should you underpin?
should he underpin?
should we underpin?
should you underpin?
should they underpin? 	should I be underpinning?
should you be underpinning?
should he be underpinning?
should we be underpinning?
should you be underpinning?
should they be underpinning? 	should I have underpinned?
should you have underpinned?
should he have underpinned?
should we have underpinned?
should you have underpinned?
should they have underpinned? 	should I have been underpinning?
should you have been underpinning?
should he have been underpinning?
should we have been underpinning?
should you have been underpinning?
should they have been underpinning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I not underpin?
should you not underpin?
should he not underpin?
should we not underpin?
should you not underpin?
should they not underpin? 	should I not be underpinning?
should you not be underpinning?
should he not be underpinning?
should we not be underpinning?
should you not be underpinning?
should they not be underpinning? 	should I not have underpinned?
should you not have underpinned?
should he not have underpinned?
should we not have underpinned?
should you not have underpinned?
should they not have underpinned? 	should I not have been underpinning?
should you not have been underpinning?
should he not have been underpinning?
should we not have been underpinning?
should you not have been underpinning?
should they not have been underpinning?