I must castaway you must castaway he must castaway we must castaway you must castaway they must castaway
V-ing form
I must be castawaying you must be castawaying he must be castawaying we must be castawaying you must be castawaying they must be castawaying
Perfect
I must have castawayed you must have castawayed he must have castawayed we must have castawayed you must have castawayed they must have castawayed
V-ing perfect
I must have been castawaying you must have been castawaying he must have been castawaying we must have been castawaying you must have been castawaying they must have been castawaying
Negation
Simple form
I must not castaway you must not castaway he must not castaway we must not castaway you must not castaway they must not castaway
V-ing form
I must not be castawaying you must not be castawaying he must not be castawaying we must not be castawaying you must not be castawaying they must not be castawaying
Perfect
I must not have castawayed you must not have castawayed he must not have castawayed we must not have castawayed you must not have castawayed they must not have castawayed
V-ing perfect
I must not have been castawaying you must not have been castawaying he must not have been castawaying we must not have been castawaying you must not have been castawaying they must not have been castawaying
Interrogative form
Simple form
must I castaway? must you castaway? must he castaway? must we castaway? must you castaway? must they castaway?
V-ing form
must I be castawaying? must you be castawaying? must he be castawaying? must we be castawaying? must you be castawaying? must they be castawaying?
Perfect
must I have castawayed? must you have castawayed? must he have castawayed? must we have castawayed? must you have castawayed? must they have castawayed?
V-ing perfect
must I have been castawaying? must you have been castawaying? must he have been castawaying? must we have been castawaying? must you have been castawaying? must they have been castawaying?
Interro-negative form
Simple form
must I not castaway? must you not castaway? must he not castaway? must we not castaway? must you not castaway? must they not castaway?
V-ing form
must I not be castawaying? must you not be castawaying? must he not be castawaying? must we not be castawaying? must you not be castawaying? must they not be castawaying?
Perfect
must I not have castawayed? must you not have castawayed? must he not have castawayed? must we not have castawayed? must you not have castawayed? must they not have castawayed?
V-ing perfect
must I not have been castawaying? must you not have been castawaying? must he not have been castawaying? must we not have been castawaying? must you not have been castawaying? must they not have been castawaying?