must letter
Verbe régulier : letter - lettered- lettered
Traduction française : inscrire des lettres sur - graver (des lettres sur) 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must letter
you must letter
she must letter
we must letter
you must letter
they must letter 	I must be lettering
you must be lettering
she must be lettering
we must be lettering
you must be lettering
they must be lettering	I must have lettered
you must have lettered
she must have lettered
we must have lettered
you must have lettered
they must have lettered	I must have been lettering
you must have been lettering
she must have been lettering
we must have been lettering
you must have been lettering
they must have been lettering	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must not letter
you must not letter
she must not letter
we must not letter
you must not letter
they must not letter 	I must not be lettering
you must not be lettering
she must not be lettering
we must not be lettering
you must not be lettering
they must not be lettering	I must not have lettered
you must not have lettered
she must not have lettered
we must not have lettered
you must not have lettered
they must not have lettered	I must not have been lettering
you must not have been lettering
she must not have been lettering
we must not have been lettering
you must not have been lettering
they must not have been lettering	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I letter?
must you letter?
must she letter?
must we letter?
must you letter?
must they letter? 	must I be lettering?
must you be lettering?
must she be lettering?
must we be lettering?
must you be lettering?
must they be lettering? 	must I have lettered?
must you have lettered?
must she have lettered?
must we have lettered?
must you have lettered?
must they have lettered? 	must I have been lettering?
must you have been lettering?
must she have been lettering?
must we have been lettering?
must you have been lettering?
must they have been lettering? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I not letter?
must you not letter?
must she not letter?
must we not letter?
must you not letter?
must they not letter? 	must I not be lettering?
must you not be lettering?
must she not be lettering?
must we not be lettering?
must you not be lettering?
must they not be lettering? 	must I not have lettered?
must you not have lettered?
must she not have lettered?
must we not have lettered?
must you not have lettered?
must they not have lettered? 	must I not have been lettering?
must you not have been lettering?
must she not have been lettering?
must we not have been lettering?
must you not have been lettering?
must they not have been lettering?