can yack
Verbe régulier : yack - yacked- yacked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I can yack
you can yack
he can yack
we can yack
you can yack
they can yack 	I can be yacking
you can be yacking
he can be yacking
we can be yacking
you can be yacking
they can be yacking	I can have yacked
you can have yacked
he can have yacked
we can have yacked
you can have yacked
they can have yacked	I can have been yacking
you can have been yacking
he can have been yacking
we can have been yacking
you can have been yacking
they can have been yacking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I can't yack
you can't yack
he can't yack
we can't yack
you can't yack
they can't yack 	I can't be yacking
you can't be yacking
he can't be yacking
we can't be yacking
you can't be yacking
they can't be yacking	I can't have yacked
you can't have yacked
he can't have yacked
we can't have yacked
you can't have yacked
they can't have yacked	I can't have been yacking
you can't have been yacking
he can't have been yacking
we can't have been yacking
you can't have been yacking
they can't have been yacking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can I yack?
can you yack?
can he yack?
can we yack?
can you yack?
can they yack? 	can I be yacking?
can you be yacking?
can he be yacking?
can we be yacking?
can you be yacking?
can they be yacking? 	can I have yacked?
can you have yacked?
can he have yacked?
can we have yacked?
can you have yacked?
can they have yacked? 	can I have been yacking?
can you have been yacking?
can he have been yacking?
can we have been yacking?
can you have been yacking?
can they have been yacking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
can't I yack?
can't you yack?
can't he yack?
can't we yack?
can't you yack?
can't they yack? 	can't I be yacking?
can't you be yacking?
can't he be yacking?
can't we be yacking?
can't you be yacking?
can't they be yacking? 	can't I have yacked?
can't you have yacked?
can't he have yacked?
can't we have yacked?
can't you have yacked?
can't they have yacked? 	can't I have been yacking?
can't you have been yacking?
can't he have been yacking?
can't we have been yacking?
can't you have been yacking?
can't they have been yacking?