can undersign
Verbo regular: undersign - undersigned- undersigned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can undersign
you can undersign
he can undersign
we can undersign
you can undersign
they can undersign 	I can be undersigning
you can be undersigning
he can be undersigning
we can be undersigning
you can be undersigning
they can be undersigning	I can have undersigned
you can have undersigned
he can have undersigned
we can have undersigned
you can have undersigned
they can have undersigned	I can have been undersigning
you can have been undersigning
he can have been undersigning
we can have been undersigning
you can have been undersigning
they can have been undersigning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I can't undersign
you can't undersign
he can't undersign
we can't undersign
you can't undersign
they can't undersign 	I can't be undersigning
you can't be undersigning
he can't be undersigning
we can't be undersigning
you can't be undersigning
they can't be undersigning	I can't have undersigned
you can't have undersigned
he can't have undersigned
we can't have undersigned
you can't have undersigned
they can't have undersigned	I can't have been undersigning
you can't have been undersigning
he can't have been undersigning
we can't have been undersigning
you can't have been undersigning
they can't have been undersigning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can I undersign?
can you undersign?
can he undersign?
can we undersign?
can you undersign?
can they undersign? 	can I be undersigning?
can you be undersigning?
can he be undersigning?
can we be undersigning?
can you be undersigning?
can they be undersigning? 	can I have undersigned?
can you have undersigned?
can he have undersigned?
can we have undersigned?
can you have undersigned?
can they have undersigned? 	can I have been undersigning?
can you have been undersigning?
can he have been undersigning?
can we have been undersigning?
can you have been undersigning?
can they have been undersigning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
can't I undersign?
can't you undersign?
can't he undersign?
can't we undersign?
can't you undersign?
can't they undersign? 	can't I be undersigning?
can't you be undersigning?
can't he be undersigning?
can't we be undersigning?
can't you be undersigning?
can't they be undersigning? 	can't I have undersigned?
can't you have undersigned?
can't he have undersigned?
can't we have undersigned?
can't you have undersigned?
can't they have undersigned? 	can't I have been undersigning?
can't you have been undersigning?
can't he have been undersigning?
can't we have been undersigning?
can't you have been undersigning?
can't they have been undersigning?