I must castaway you must castaway she must castaway we must castaway you must castaway they must castaway
V-ing form
I must be castawaying you must be castawaying she must be castawaying we must be castawaying you must be castawaying they must be castawaying
Perfect
I must have castawayed you must have castawayed she 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 she 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 she 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 she 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 she 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 she 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 she castaway? must we castaway? must you castaway? must they castaway?
V-ing form
must I be castawaying? must you be castawaying? must she be castawaying? must we be castawaying? must you be castawaying? must they be castawaying?
Perfect
must I have castawayed? must you have castawayed? must she 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 she 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 she 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 she 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 she 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 she not have been castawaying? must we not have been castawaying? must you not have been castawaying? must they not have been castawaying?