can underpin
Verbo regular: underpin - underpinned- underpinned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can underpin
you can underpin
he can underpin
we can underpin
you can underpin
they can underpin 	I can be underpinning
you can be underpinning
he can be underpinning
we can be underpinning
you can be underpinning
they can be underpinning	I can have underpinned
you can have underpinned
he can have underpinned
we can have underpinned
you can have underpinned
they can have underpinned	I can have been underpinning
you can have been underpinning
he can have been underpinning
we can have been underpinning
you can have been underpinning
they can have been underpinning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot underpin
you cannot underpin
he cannot underpin
we cannot underpin
you cannot underpin
they cannot underpin 	I cannot be underpinning
you cannot be underpinning
he cannot be underpinning
we cannot be underpinning
you cannot be underpinning
they cannot be underpinning	I cannot have underpinned
you cannot have underpinned
he cannot have underpinned
we cannot have underpinned
you cannot have underpinned
they cannot have underpinned	I cannot have been underpinning
you cannot have been underpinning
he cannot have been underpinning
we cannot have been underpinning
you cannot have been underpinning
they cannot have been underpinning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I underpin?
can you underpin?
can he underpin?
can we underpin?
can you underpin?
can they underpin? 	can I be underpinning?
can you be underpinning?
can he be underpinning?
can we be underpinning?
can you be underpinning?
can they be underpinning? 	can I have underpinned?
can you have underpinned?
can he have underpinned?
can we have underpinned?
can you have underpinned?
can they have underpinned? 	can I have been underpinning?
can you have been underpinning?
can he have been underpinning?
can we have been underpinning?
can you have been underpinning?
can they have been underpinning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not underpin?
can you not underpin?
can he not underpin?
can we not underpin?
can you not underpin?
can they not underpin? 	can I not be underpinning?
can you not be underpinning?
can he not be underpinning?
can we not be underpinning?
can you not be underpinning?
can they not be underpinning? 	can I not have underpinned?
can you not have underpinned?
can he not have underpinned?
can we not have underpinned?
can you not have underpinned?
can they not have underpinned? 	can I not have been underpinning?
can you not have been underpinning?
can he not have been underpinning?
can we not have been underpinning?
can you not have been underpinning?
can they not have been underpinning?