can undersign
Verbe régulier : undersign - undersigned- undersigned

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I cannot undersign
you cannot undersign
he cannot undersign
we cannot undersign
you cannot undersign
they cannot undersign 	I cannot be undersigning
you cannot be undersigning
he cannot be undersigning
we cannot be undersigning
you cannot be undersigning
they cannot be undersigning	I cannot have undersigned
you cannot have undersigned
he cannot have undersigned
we cannot have undersigned
you cannot have undersigned
they cannot have undersigned	I cannot have been undersigning
you cannot have been undersigning
he cannot have been undersigning
we cannot have been undersigning
you cannot have been undersigning
they cannot have been undersigning	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en 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? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can I not undersign?
can you not undersign?
can he not undersign?
can we not undersign?
can you not undersign?
can they not undersign? 	can I not be undersigning?
can you not be undersigning?
can he not be undersigning?
can we not be undersigning?
can you not be undersigning?
can they not be undersigning? 	can I not have undersigned?
can you not have undersigned?
can he not have undersigned?
can we not have undersigned?
can you not have undersigned?
can they not have undersigned? 	can I not have been undersigning?
can you not have been undersigning?
can he not have been undersigning?
can we not have been undersigning?
can you not have been undersigning?
can they not have been undersigning?