could master
Regelmä&szlig;iges Verb: master - mastered- mastered

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could master
you could master
he could master
we could master
you could master
they could master 	I could be mastering
you could be mastering
he could be mastering
we could be mastering
you could be mastering
they could be mastering	I could have mastered
you could have mastered
he could have mastered
we could have mastered
you could have mastered
they could have mastered	I could have been mastering
you could have been mastering
he could have been mastering
we could have been mastering
you could have been mastering
they could have been mastering	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I couldn't master
you couldn't master
he couldn't master
we couldn't master
you couldn't master
they couldn't master 	I couldn't be mastering
you couldn't be mastering
he couldn't be mastering
we couldn't be mastering
you couldn't be mastering
they couldn't be mastering	I couldn't have mastered
you couldn't have mastered
he couldn't have mastered
we couldn't have mastered
you couldn't have mastered
they couldn't have mastered	I couldn't have been mastering
you couldn't have been mastering
he couldn't have been mastering
we couldn't have been mastering
you couldn't have been mastering
they couldn't have been mastering	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I master?
could you master?
could he master?
could we master?
could you master?
could they master? 	could I be mastering?
could you be mastering?
could he be mastering?
could we be mastering?
could you be mastering?
could they be mastering? 	could I have mastered?
could you have mastered?
could he have mastered?
could we have mastered?
could you have mastered?
could they have mastered? 	could I have been mastering?
could you have been mastering?
could he have been mastering?
could we have been mastering?
could you have been mastering?
could they have been mastering? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
couldn't I master?
couldn't you master?
couldn't he master?
couldn't we master?
couldn't you master?
couldn't they master? 	couldn't I be mastering?
couldn't you be mastering?
couldn't he be mastering?
couldn't we be mastering?
couldn't you be mastering?
couldn't they be mastering? 	couldn't I have mastered?
couldn't you have mastered?
couldn't he have mastered?
couldn't we have mastered?
couldn't you have mastered?
couldn't they have mastered? 	couldn't I have been mastering?
couldn't you have been mastering?
couldn't he have been mastering?
couldn't we have been mastering?
couldn't you have been mastering?
couldn't they have been mastering?