I must comprehend you must comprehend he must comprehend we must comprehend you must comprehend they must comprehend
V-ing form
I must be comprehending you must be comprehending he must be comprehending we must be comprehending you must be comprehending they must be comprehending
Perfect
I must have comprehended you must have comprehended he must have comprehended we must have comprehended you must have comprehended they must have comprehended
V-ing perfect
I must have been comprehending you must have been comprehending he must have been comprehending we must have been comprehending you must have been comprehending they must have been comprehending
Negation
Simple form
I must not comprehend you must not comprehend he must not comprehend we must not comprehend you must not comprehend they must not comprehend
V-ing form
I must not be comprehending you must not be comprehending he must not be comprehending we must not be comprehending you must not be comprehending they must not be comprehending
Perfect
I must not have comprehended you must not have comprehended he must not have comprehended we must not have comprehended you must not have comprehended they must not have comprehended
V-ing perfect
I must not have been comprehending you must not have been comprehending he must not have been comprehending we must not have been comprehending you must not have been comprehending they must not have been comprehending
Interrogative form
Simple form
must I comprehend? must you comprehend? must he comprehend? must we comprehend? must you comprehend? must they comprehend?
V-ing form
must I be comprehending? must you be comprehending? must he be comprehending? must we be comprehending? must you be comprehending? must they be comprehending?
Perfect
must I have comprehended? must you have comprehended? must he have comprehended? must we have comprehended? must you have comprehended? must they have comprehended?
V-ing perfect
must I have been comprehending? must you have been comprehending? must he have been comprehending? must we have been comprehending? must you have been comprehending? must they have been comprehending?
Interro-negative form
Simple form
must I not comprehend? must you not comprehend? must he not comprehend? must we not comprehend? must you not comprehend? must they not comprehend?
V-ing form
must I not be comprehending? must you not be comprehending? must he not be comprehending? must we not be comprehending? must you not be comprehending? must they not be comprehending?
Perfect
must I not have comprehended? must you not have comprehended? must he not have comprehended? must we not have comprehended? must you not have comprehended? must they not have comprehended?
V-ing perfect
must I not have been comprehending? must you not have been comprehending? must he not have been comprehending? must we not have been comprehending? must you not have been comprehending? must they not have been comprehending?