I must letch you must letch he must letch we must letch you must letch they must letch
Forme en V-ing
I must be letching you must be letching he must be letching we must be letching you must be letching they must be letching
Perfect
I must have letched you must have letched he must have letched we must have letched you must have letched they must have letched
Perfect en V-ing
I must have been letching you must have been letching he must have been letching we must have been letching you must have been letching they must have been letching
Négation
Forme simple
I must not letch you must not letch he must not letch we must not letch you must not letch they must not letch
Forme en V-ing
I must not be letching you must not be letching he must not be letching we must not be letching you must not be letching they must not be letching
Perfect
I must not have letched you must not have letched he must not have letched we must not have letched you must not have letched they must not have letched
Perfect en V-ing
I must not have been letching you must not have been letching he must not have been letching we must not have been letching you must not have been letching they must not have been letching
Forme interrogative
Forme simple
must I letch? must you letch? must he letch? must we letch? must you letch? must they letch?
Forme en V-ing
must I be letching? must you be letching? must he be letching? must we be letching? must you be letching? must they be letching?
Perfect
must I have letched? must you have letched? must he have letched? must we have letched? must you have letched? must they have letched?
Perfect en V-ing
must I have been letching? must you have been letching? must he have been letching? must we have been letching? must you have been letching? must they have been letching?
Forme interro-négative
Forme simple
must I not letch? must you not letch? must he not letch? must we not letch? must you not letch? must they not letch?
Forme en V-ing
must I not be letching? must you not be letching? must he not be letching? must we not be letching? must you not be letching? must they not be letching?
Perfect
must I not have letched? must you not have letched? must he not have letched? must we not have letched? must you not have letched? must they not have letched?
Perfect en V-ing
must I not have been letching? must you not have been letching? must he not have been letching? must we not have been letching? must you not have been letching? must they not have been letching?