could percuss
Verbe régulier : percuss - percussed- percussed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could percuss
you could percuss
he could percuss
we could percuss
you could percuss
they could percuss 	I could be percussing
you could be percussing
he could be percussing
we could be percussing
you could be percussing
they could be percussing	I could have percussed
you could have percussed
he could have percussed
we could have percussed
you could have percussed
they could have percussed	I could have been percussing
you could have been percussing
he could have been percussing
we could have been percussing
you could have been percussing
they could have been percussing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't percuss
you couldn't percuss
he couldn't percuss
we couldn't percuss
you couldn't percuss
they couldn't percuss 	I couldn't be percussing
you couldn't be percussing
he couldn't be percussing
we couldn't be percussing
you couldn't be percussing
they couldn't be percussing	I couldn't have percussed
you couldn't have percussed
he couldn't have percussed
we couldn't have percussed
you couldn't have percussed
they couldn't have percussed	I couldn't have been percussing
you couldn't have been percussing
he couldn't have been percussing
we couldn't have been percussing
you couldn't have been percussing
they couldn't have been percussing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I percuss?
could you percuss?
could he percuss?
could we percuss?
could you percuss?
could they percuss? 	could I be percussing?
could you be percussing?
could he be percussing?
could we be percussing?
could you be percussing?
could they be percussing? 	could I have percussed?
could you have percussed?
could he have percussed?
could we have percussed?
could you have percussed?
could they have percussed? 	could I have been percussing?
could you have been percussing?
could he have been percussing?
could we have been percussing?
could you have been percussing?
could they have been percussing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I percuss?
couldn't you percuss?
couldn't he percuss?
couldn't we percuss?
couldn't you percuss?
couldn't they percuss? 	couldn't I be percussing?
couldn't you be percussing?
couldn't he be percussing?
couldn't we be percussing?
couldn't you be percussing?
couldn't they be percussing? 	couldn't I have percussed?
couldn't you have percussed?
couldn't he have percussed?
couldn't we have percussed?
couldn't you have percussed?
couldn't they have percussed? 	couldn't I have been percussing?
couldn't you have been percussing?
couldn't he have been percussing?
couldn't we have been percussing?
couldn't you have been percussing?
couldn't they have been percussing?