I must aver you must aver he must aver we must aver you must aver they must aver
V-ing form
I must be averring you must be averring he must be averring we must be averring you must be averring they must be averring
Perfect
I must have averred you must have averred he must have averred we must have averred you must have averred they must have averred
V-ing perfect
I must have been averring you must have been averring he must have been averring we must have been averring you must have been averring they must have been averring
Negation
Simple form
I must not aver you must not aver he must not aver we must not aver you must not aver they must not aver
V-ing form
I must not be averring you must not be averring he must not be averring we must not be averring you must not be averring they must not be averring
Perfect
I must not have averred you must not have averred he must not have averred we must not have averred you must not have averred they must not have averred
V-ing perfect
I must not have been averring you must not have been averring he must not have been averring we must not have been averring you must not have been averring they must not have been averring
Interrogative form
Simple form
must I aver? must you aver? must he aver? must we aver? must you aver? must they aver?
V-ing form
must I be averring? must you be averring? must he be averring? must we be averring? must you be averring? must they be averring?
Perfect
must I have averred? must you have averred? must he have averred? must we have averred? must you have averred? must they have averred?
V-ing perfect
must I have been averring? must you have been averring? must he have been averring? must we have been averring? must you have been averring? must they have been averring?
Interro-negative form
Simple form
must I not aver? must you not aver? must he not aver? must we not aver? must you not aver? must they not aver?
V-ing form
must I not be averring? must you not be averring? must he not be averring? must we not be averring? must you not be averring? must they not be averring?
Perfect
must I not have averred? must you not have averred? must he not have averred? must we not have averred? must you not have averred? must they not have averred?
V-ing perfect
must I not have been averring? must you not have been averring? must he not have been averring? must we not have been averring? must you not have been averring? must they not have been averring?