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