could contribute
Regelmä&szlig;iges Verb: contribute - contributed- contributed

Bestätigung 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I could contribute
you could contribute
he could contribute
we could contribute
you could contribute
they could contribute 	I could be contributing
you could be contributing
he could be contributing
we could be contributing
you could be contributing
they could be contributing	I could have contributed
you could have contributed
he could have contributed
we could have contributed
you could have contributed
they could have contributed	I could have been contributing
you could have been contributing
he could have been contributing
we could have been contributing
you could have been contributing
they could have been contributing	

Negation 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
I couldn't contribute
you couldn't contribute
he couldn't contribute
we couldn't contribute
you couldn't contribute
they couldn't contribute 	I couldn't be contributing
you couldn't be contributing
he couldn't be contributing
we couldn't be contributing
you couldn't be contributing
they couldn't be contributing	I couldn't have contributed
you couldn't have contributed
he couldn't have contributed
we couldn't have contributed
you couldn't have contributed
they couldn't have contributed	I couldn't have been contributing
you couldn't have been contributing
he couldn't have been contributing
we couldn't have been contributing
you couldn't have been contributing
they couldn't have been contributing	

Fragende Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
could I contribute?
could you contribute?
could he contribute?
could we contribute?
could you contribute?
could they contribute? 	could I be contributing?
could you be contributing?
could he be contributing?
could we be contributing?
could you be contributing?
could they be contributing? 	could I have contributed?
could you have contributed?
could he have contributed?
could we have contributed?
could you have contributed?
could they have contributed? 	could I have been contributing?
could you have been contributing?
could he have been contributing?
could we have been contributing?
could you have been contributing?
could they have been contributing? 	

Fragende Negation Form 	
Einfache Form 	Form mit V-ing 	Perfekt 	Perfekt mit V-ing 	
couldn't I contribute?
couldn't you contribute?
couldn't he contribute?
couldn't we contribute?
couldn't you contribute?
couldn't they contribute? 	couldn't I be contributing?
couldn't you be contributing?
couldn't he be contributing?
couldn't we be contributing?
couldn't you be contributing?
couldn't they be contributing? 	couldn't I have contributed?
couldn't you have contributed?
couldn't he have contributed?
couldn't we have contributed?
couldn't you have contributed?
couldn't they have contributed? 	couldn't I have been contributing?
couldn't you have been contributing?
couldn't he have been contributing?
couldn't we have been contributing?
couldn't you have been contributing?
couldn't they have been contributing?