must buttress
Verbe régulier : buttress - buttressed- buttressed
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Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must buttress
you must buttress
she must buttress
we must buttress
you must buttress
they must buttress 	I must be buttressing
you must be buttressing
she must be buttressing
we must be buttressing
you must be buttressing
they must be buttressing	I must have buttressed
you must have buttressed
she must have buttressed
we must have buttressed
you must have buttressed
they must have buttressed	I must have been buttressing
you must have been buttressing
she must have been buttressing
we must have been buttressing
you must have been buttressing
they must have been buttressing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't buttress
you mustn't buttress
she mustn't buttress
we mustn't buttress
you mustn't buttress
they mustn't buttress 	I mustn't be buttressing
you mustn't be buttressing
she mustn't be buttressing
we mustn't be buttressing
you mustn't be buttressing
they mustn't be buttressing	I mustn't have buttressed
you mustn't have buttressed
she mustn't have buttressed
we mustn't have buttressed
you mustn't have buttressed
they mustn't have buttressed	I mustn't have been buttressing
you mustn't have been buttressing
she mustn't have been buttressing
we mustn't have been buttressing
you mustn't have been buttressing
they mustn't have been buttressing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I buttress?
must you buttress?
must she buttress?
must we buttress?
must you buttress?
must they buttress? 	must I be buttressing?
must you be buttressing?
must she be buttressing?
must we be buttressing?
must you be buttressing?
must they be buttressing? 	must I have buttressed?
must you have buttressed?
must she have buttressed?
must we have buttressed?
must you have buttressed?
must they have buttressed? 	must I have been buttressing?
must you have been buttressing?
must she have been buttressing?
must we have been buttressing?
must you have been buttressing?
must they have been buttressing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I buttress?
mustn't you buttress?
mustn't she buttress?
mustn't we buttress?
mustn't you buttress?
mustn't they buttress? 	mustn't I be buttressing?
mustn't you be buttressing?
mustn't she be buttressing?
mustn't we be buttressing?
mustn't you be buttressing?
mustn't they be buttressing? 	mustn't I have buttressed?
mustn't you have buttressed?
mustn't she have buttressed?
mustn't we have buttressed?
mustn't you have buttressed?
mustn't they have buttressed? 	mustn't I have been buttressing?
mustn't you have been buttressing?
mustn't she have been buttressing?
mustn't we have been buttressing?
mustn't you have been buttressing?
mustn't they have been buttressing?