could sign
Verbe régulier : sign - signed- signed
Traduction française : signer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could sign
you could sign
she could sign
we could sign
you could sign
they could sign 	I could be signing
you could be signing
she could be signing
we could be signing
you could be signing
they could be signing	I could have signed
you could have signed
she could have signed
we could have signed
you could have signed
they could have signed	I could have been signing
you could have been signing
she could have been signing
we could have been signing
you could have been signing
they could have been signing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could not sign
you could not sign
she could not sign
we could not sign
you could not sign
they could not sign 	I could not be signing
you could not be signing
she could not be signing
we could not be signing
you could not be signing
they could not be signing	I could not have signed
you could not have signed
she could not have signed
we could not have signed
you could not have signed
they could not have signed	I could not have been signing
you could not have been signing
she could not have been signing
we could not have been signing
you could not have been signing
they could not have been signing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I sign?
could you sign?
could she sign?
could we sign?
could you sign?
could they sign? 	could I be signing?
could you be signing?
could she be signing?
could we be signing?
could you be signing?
could they be signing? 	could I have signed?
could you have signed?
could she have signed?
could we have signed?
could you have signed?
could they have signed? 	could I have been signing?
could you have been signing?
could she have been signing?
could we have been signing?
could you have been signing?
could they have been signing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I not sign?
could you not sign?
could she not sign?
could we not sign?
could you not sign?
could they not sign? 	could I not be signing?
could you not be signing?
could she not be signing?
could we not be signing?
could you not be signing?
could they not be signing? 	could I not have signed?
could you not have signed?
could she not have signed?
could we not have signed?
could you not have signed?
could they not have signed? 	could I not have been signing?
could you not have been signing?
could she not have been signing?
could we not have been signing?
could you not have been signing?
could they not have been signing?