I must unlatch you must unlatch she must unlatch we must unlatch you must unlatch they must unlatch
V-ing form
I must be unlatching you must be unlatching she must be unlatching we must be unlatching you must be unlatching they must be unlatching
Perfect
I must have unlatched you must have unlatched she must have unlatched we must have unlatched you must have unlatched they must have unlatched
V-ing perfect
I must have been unlatching you must have been unlatching she must have been unlatching we must have been unlatching you must have been unlatching they must have been unlatching
Negation
Simple form
I must not unlatch you must not unlatch she must not unlatch we must not unlatch you must not unlatch they must not unlatch
V-ing form
I must not be unlatching you must not be unlatching she must not be unlatching we must not be unlatching you must not be unlatching they must not be unlatching
Perfect
I must not have unlatched you must not have unlatched she must not have unlatched we must not have unlatched you must not have unlatched they must not have unlatched
V-ing perfect
I must not have been unlatching you must not have been unlatching she must not have been unlatching we must not have been unlatching you must not have been unlatching they must not have been unlatching
Interrogative form
Simple form
must I unlatch? must you unlatch? must she unlatch? must we unlatch? must you unlatch? must they unlatch?
V-ing form
must I be unlatching? must you be unlatching? must she be unlatching? must we be unlatching? must you be unlatching? must they be unlatching?
Perfect
must I have unlatched? must you have unlatched? must she have unlatched? must we have unlatched? must you have unlatched? must they have unlatched?
V-ing perfect
must I have been unlatching? must you have been unlatching? must she have been unlatching? must we have been unlatching? must you have been unlatching? must they have been unlatching?
Interro-negative form
Simple form
must I not unlatch? must you not unlatch? must she not unlatch? must we not unlatch? must you not unlatch? must they not unlatch?
V-ing form
must I not be unlatching? must you not be unlatching? must she not be unlatching? must we not be unlatching? must you not be unlatching? must they not be unlatching?
Perfect
must I not have unlatched? must you not have unlatched? must she not have unlatched? must we not have unlatched? must you not have unlatched? must they not have unlatched?
V-ing perfect
must I not have been unlatching? must you not have been unlatching? must she not have been unlatching? must we not have been unlatching? must you not have been unlatching? must they not have been unlatching?