I must lecture you must lecture she must lecture we must lecture you must lecture they must lecture
V-ing form
I must be lecturing you must be lecturing she must be lecturing we must be lecturing you must be lecturing they must be lecturing
Perfect
I must have lectured you must have lectured she must have lectured we must have lectured you must have lectured they must have lectured
V-ing perfect
I must have been lecturing you must have been lecturing she must have been lecturing we must have been lecturing you must have been lecturing they must have been lecturing
Negation
Simple form
I must not lecture you must not lecture she must not lecture we must not lecture you must not lecture they must not lecture
V-ing form
I must not be lecturing you must not be lecturing she must not be lecturing we must not be lecturing you must not be lecturing they must not be lecturing
Perfect
I must not have lectured you must not have lectured she must not have lectured we must not have lectured you must not have lectured they must not have lectured
V-ing perfect
I must not have been lecturing you must not have been lecturing she must not have been lecturing we must not have been lecturing you must not have been lecturing they must not have been lecturing
Interrogative form
Simple form
must I lecture? must you lecture? must she lecture? must we lecture? must you lecture? must they lecture?
V-ing form
must I be lecturing? must you be lecturing? must she be lecturing? must we be lecturing? must you be lecturing? must they be lecturing?
Perfect
must I have lectured? must you have lectured? must she have lectured? must we have lectured? must you have lectured? must they have lectured?
V-ing perfect
must I have been lecturing? must you have been lecturing? must she have been lecturing? must we have been lecturing? must you have been lecturing? must they have been lecturing?
Interro-negative form
Simple form
must I not lecture? must you not lecture? must she not lecture? must we not lecture? must you not lecture? must they not lecture?
V-ing form
must I not be lecturing? must you not be lecturing? must she not be lecturing? must we not be lecturing? must you not be lecturing? must they not be lecturing?
Perfect
must I not have lectured? must you not have lectured? must she not have lectured? must we not have lectured? must you not have lectured? must they not have lectured?
V-ing perfect
must I not have been lecturing? must you not have been lecturing? must she not have been lecturing? must we not have been lecturing? must you not have been lecturing? must they not have been lecturing?