I must lightning you must lightning he must lightning we must lightning you must lightning they must lightning
V-ing form
I must be lightninging you must be lightninging he must be lightninging we must be lightninging you must be lightninging they must be lightninging
Perfect
I must have lightninged you must have lightninged he must have lightninged we must have lightninged you must have lightninged they must have lightninged
V-ing perfect
I must have been lightninging you must have been lightninging he must have been lightninging we must have been lightninging you must have been lightninging they must have been lightninging
Negation
Simple form
I must not lightning you must not lightning he must not lightning we must not lightning you must not lightning they must not lightning
V-ing form
I must not be lightninging you must not be lightninging he must not be lightninging we must not be lightninging you must not be lightninging they must not be lightninging
Perfect
I must not have lightninged you must not have lightninged he must not have lightninged we must not have lightninged you must not have lightninged they must not have lightninged
V-ing perfect
I must not have been lightninging you must not have been lightninging he must not have been lightninging we must not have been lightninging you must not have been lightninging they must not have been lightninging
Interrogative form
Simple form
must I lightning? must you lightning? must he lightning? must we lightning? must you lightning? must they lightning?
V-ing form
must I be lightninging? must you be lightninging? must he be lightninging? must we be lightninging? must you be lightninging? must they be lightninging?
Perfect
must I have lightninged? must you have lightninged? must he have lightninged? must we have lightninged? must you have lightninged? must they have lightninged?
V-ing perfect
must I have been lightninging? must you have been lightninging? must he have been lightninging? must we have been lightninging? must you have been lightninging? must they have been lightninging?
Interro-negative form
Simple form
must I not lightning? must you not lightning? must he not lightning? must we not lightning? must you not lightning? must they not lightning?
V-ing form
must I not be lightninging? must you not be lightninging? must he not be lightninging? must we not be lightninging? must you not be lightninging? must they not be lightninging?
Perfect
must I not have lightninged? must you not have lightninged? must he not have lightninged? must we not have lightninged? must you not have lightninged? must they not have lightninged?
V-ing perfect
must I not have been lightninging? must you not have been lightninging? must he not have been lightninging? must we not have been lightninging? must you not have been lightninging? must they not have been lightninging?