I must preside you must preside he must preside we must preside you must preside they must preside
V-ing form
I must be presiding you must be presiding he must be presiding we must be presiding you must be presiding they must be presiding
Perfect
I must have presided you must have presided he must have presided we must have presided you must have presided they must have presided
V-ing perfect
I must have been presiding you must have been presiding he must have been presiding we must have been presiding you must have been presiding they must have been presiding
Negation
Simple form
I must not preside you must not preside he must not preside we must not preside you must not preside they must not preside
V-ing form
I must not be presiding you must not be presiding he must not be presiding we must not be presiding you must not be presiding they must not be presiding
Perfect
I must not have presided you must not have presided he must not have presided we must not have presided you must not have presided they must not have presided
V-ing perfect
I must not have been presiding you must not have been presiding he must not have been presiding we must not have been presiding you must not have been presiding they must not have been presiding
Interrogative form
Simple form
must I preside? must you preside? must he preside? must we preside? must you preside? must they preside?
V-ing form
must I be presiding? must you be presiding? must he be presiding? must we be presiding? must you be presiding? must they be presiding?
Perfect
must I have presided? must you have presided? must he have presided? must we have presided? must you have presided? must they have presided?
V-ing perfect
must I have been presiding? must you have been presiding? must he have been presiding? must we have been presiding? must you have been presiding? must they have been presiding?
Interro-negative form
Simple form
must I not preside? must you not preside? must he not preside? must we not preside? must you not preside? must they not preside?
V-ing form
must I not be presiding? must you not be presiding? must he not be presiding? must we not be presiding? must you not be presiding? must they not be presiding?
Perfect
must I not have presided? must you not have presided? must he not have presided? must we not have presided? must you not have presided? must they not have presided?
V-ing perfect
must I not have been presiding? must you not have been presiding? must he not have been presiding? must we not have been presiding? must you not have been presiding? must they not have been presiding?