must firm
Verbe régulier : firm - firmed- firmed
Traduction française : tasser - se raffermir 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must firm
you must firm
she must firm
we must firm
you must firm
they must firm 	I must be firming
you must be firming
she must be firming
we must be firming
you must be firming
they must be firming	I must have firmed
you must have firmed
she must have firmed
we must have firmed
you must have firmed
they must have firmed	I must have been firming
you must have been firming
she must have been firming
we must have been firming
you must have been firming
they must have been firming	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not firm
you must not firm
she must not firm
we must not firm
you must not firm
they must not firm 	I must not be firming
you must not be firming
she must not be firming
we must not be firming
you must not be firming
they must not be firming	I must not have firmed
you must not have firmed
she must not have firmed
we must not have firmed
you must not have firmed
they must not have firmed	I must not have been firming
you must not have been firming
she must not have been firming
we must not have been firming
you must not have been firming
they must not have been firming	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I firm?
must you firm?
must she firm?
must we firm?
must you firm?
must they firm? 	must I be firming?
must you be firming?
must she be firming?
must we be firming?
must you be firming?
must they be firming? 	must I have firmed?
must you have firmed?
must she have firmed?
must we have firmed?
must you have firmed?
must they have firmed? 	must I have been firming?
must you have been firming?
must she have been firming?
must we have been firming?
must you have been firming?
must they have been firming? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not firm?
must you not firm?
must she not firm?
must we not firm?
must you not firm?
must they not firm? 	must I not be firming?
must you not be firming?
must she not be firming?
must we not be firming?
must you not be firming?
must they not be firming? 	must I not have firmed?
must you not have firmed?
must she not have firmed?
must we not have firmed?
must you not have firmed?
must they not have firmed? 	must I not have been firming?
must you not have been firming?
must she not have been firming?
must we not have been firming?
must you not have been firming?
must they not have been firming?