must contribute
Verbe régulier : contribute - contributed- contributed
Traduction française : donner - contribuer 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must contribute
you must contribute
he must contribute
we must contribute
you must contribute
they must contribute 	I must be contributing
you must be contributing
he must be contributing
we must be contributing
you must be contributing
they must be contributing	I must have contributed
you must have contributed
he must have contributed
we must have contributed
you must have contributed
they must have contributed	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 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not contribute
you must not contribute
he must not contribute
we must not contribute
you must not contribute
they must not contribute 	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	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	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 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I contribute?
must you contribute?
must he contribute?
must we contribute?
must you contribute?
must they contribute? 	must I be contributing?
must you be contributing?
must he be contributing?
must we be contributing?
must you be contributing?
must they be contributing? 	must I have contributed?
must you have contributed?
must he have contributed?
must we have contributed?
must you have contributed?
must they have contributed? 	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 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not contribute?
must you not contribute?
must he not contribute?
must we not contribute?
must you not contribute?
must they not contribute? 	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? 	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? 	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?