I must comment you must comment he must comment we must comment you must comment they must comment
V-ing form
I must be commenting you must be commenting he must be commenting we must be commenting you must be commenting they must be commenting
Perfect
I must have commented you must have commented he must have commented we must have commented you must have commented they must have commented
V-ing perfect
I must have been commenting you must have been commenting he must have been commenting we must have been commenting you must have been commenting they must have been commenting
Negation
Simple form
I must not comment you must not comment he must not comment we must not comment you must not comment they must not comment
V-ing form
I must not be commenting you must not be commenting he must not be commenting we must not be commenting you must not be commenting they must not be commenting
Perfect
I must not have commented you must not have commented he must not have commented we must not have commented you must not have commented they must not have commented
V-ing perfect
I must not have been commenting you must not have been commenting he must not have been commenting we must not have been commenting you must not have been commenting they must not have been commenting
Interrogative form
Simple form
must I comment? must you comment? must he comment? must we comment? must you comment? must they comment?
V-ing form
must I be commenting? must you be commenting? must he be commenting? must we be commenting? must you be commenting? must they be commenting?
Perfect
must I have commented? must you have commented? must he have commented? must we have commented? must you have commented? must they have commented?
V-ing perfect
must I have been commenting? must you have been commenting? must he have been commenting? must we have been commenting? must you have been commenting? must they have been commenting?
Interro-negative form
Simple form
must I not comment? must you not comment? must he not comment? must we not comment? must you not comment? must they not comment?
V-ing form
must I not be commenting? must you not be commenting? must he not be commenting? must we not be commenting? must you not be commenting? must they not be commenting?
Perfect
must I not have commented? must you not have commented? must he not have commented? must we not have commented? must you not have commented? must they not have commented?
V-ing perfect
must I not have been commenting? must you not have been commenting? must he not have been commenting? must we not have been commenting? must you not have been commenting? must they not have been commenting?