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
she must contribute
we must contribute
you must contribute
they must contribute 	I must be contributing
you must be contributing
she must be contributing
we must be contributing
you must be contributing
they must be contributing	I must have contributed
you must have contributed
she 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
she 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 mustn't contribute
you mustn't contribute
she mustn't contribute
we mustn't contribute
you mustn't contribute
they mustn't contribute 	I mustn't be contributing
you mustn't be contributing
she mustn't be contributing
we mustn't be contributing
you mustn't be contributing
they mustn't be contributing	I mustn't have contributed
you mustn't have contributed
she mustn't have contributed
we mustn't have contributed
you mustn't have contributed
they mustn't have contributed	I mustn't have been contributing
you mustn't have been contributing
she mustn't have been contributing
we mustn't have been contributing
you mustn't have been contributing
they mustn't have been contributing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I contribute?
must you contribute?
must she contribute?
must we contribute?
must you contribute?
must they contribute? 	must I be contributing?
must you be contributing?
must she be contributing?
must we be contributing?
must you be contributing?
must they be contributing? 	must I have contributed?
must you have contributed?
must she 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 she 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 	
mustn't I contribute?
mustn't you contribute?
mustn't she contribute?
mustn't we contribute?
mustn't you contribute?
mustn't they contribute? 	mustn't I be contributing?
mustn't you be contributing?
mustn't she be contributing?
mustn't we be contributing?
mustn't you be contributing?
mustn't they be contributing? 	mustn't I have contributed?
mustn't you have contributed?
mustn't she have contributed?
mustn't we have contributed?
mustn't you have contributed?
mustn't they have contributed? 	mustn't I have been contributing?
mustn't you have been contributing?
mustn't she have been contributing?
mustn't we have been contributing?
mustn't you have been contributing?
mustn't they have been contributing?