I can contribute you can contribute she can contribute we can contribute you can contribute they can contribute
Forme en V-ing
I can be contributing you can be contributing she can be contributing we can be contributing you can be contributing they can be contributing
Perfect
I can have contributed you can have contributed she can have contributed we can have contributed you can have contributed they can have contributed
Perfect en V-ing
I can have been contributing you can have been contributing she can have been contributing we can have been contributing you can have been contributing they can have been contributing
Négation
Forme simple
I cannot contribute you cannot contribute she cannot contribute we cannot contribute you cannot contribute they cannot contribute
Forme en V-ing
I cannot be contributing you cannot be contributing she cannot be contributing we cannot be contributing you cannot be contributing they cannot be contributing
Perfect
I cannot have contributed you cannot have contributed she cannot have contributed we cannot have contributed you cannot have contributed they cannot have contributed
Perfect en V-ing
I cannot have been contributing you cannot have been contributing she cannot have been contributing we cannot have been contributing you cannot have been contributing they cannot have been contributing
Forme interrogative
Forme simple
can I contribute? can you contribute? can she contribute? can we contribute? can you contribute? can they contribute?
Forme en V-ing
can I be contributing? can you be contributing? can she be contributing? can we be contributing? can you be contributing? can they be contributing?
Perfect
can I have contributed? can you have contributed? can she have contributed? can we have contributed? can you have contributed? can they have contributed?
Perfect en V-ing
can I have been contributing? can you have been contributing? can she have been contributing? can we have been contributing? can you have been contributing? can they have been contributing?
Forme interro-négative
Forme simple
can I not contribute? can you not contribute? can she not contribute? can we not contribute? can you not contribute? can they not contribute?
Forme en V-ing
can I not be contributing? can you not be contributing? can she not be contributing? can we not be contributing? can you not be contributing? can they not be contributing?
Perfect
can I not have contributed? can you not have contributed? can she not have contributed? can we not have contributed? can you not have contributed? can they not have contributed?
Perfect en V-ing
can I not have been contributing? can you not have been contributing? can she not have been contributing? can we not have been contributing? can you not have been contributing? can they not have been contributing?