I must cross-train you must cross-train he must cross-train we must cross-train you must cross-train they must cross-train
V-ing form
I must be cross-training you must be cross-training he must be cross-training we must be cross-training you must be cross-training they must be cross-training
Perfect
I must have cross-trained you must have cross-trained he must have cross-trained we must have cross-trained you must have cross-trained they must have cross-trained
V-ing perfect
I must have been cross-training you must have been cross-training he must have been cross-training we must have been cross-training you must have been cross-training they must have been cross-training
Negation
Simple form
I must not cross-train you must not cross-train he must not cross-train we must not cross-train you must not cross-train they must not cross-train
V-ing form
I must not be cross-training you must not be cross-training he must not be cross-training we must not be cross-training you must not be cross-training they must not be cross-training
Perfect
I must not have cross-trained you must not have cross-trained he must not have cross-trained we must not have cross-trained you must not have cross-trained they must not have cross-trained
V-ing perfect
I must not have been cross-training you must not have been cross-training he must not have been cross-training we must not have been cross-training you must not have been cross-training they must not have been cross-training
Interrogative form
Simple form
must I cross-train? must you cross-train? must he cross-train? must we cross-train? must you cross-train? must they cross-train?
V-ing form
must I be cross-training? must you be cross-training? must he be cross-training? must we be cross-training? must you be cross-training? must they be cross-training?
Perfect
must I have cross-trained? must you have cross-trained? must he have cross-trained? must we have cross-trained? must you have cross-trained? must they have cross-trained?
V-ing perfect
must I have been cross-training? must you have been cross-training? must he have been cross-training? must we have been cross-training? must you have been cross-training? must they have been cross-training?
Interro-negative form
Simple form
must I not cross-train? must you not cross-train? must he not cross-train? must we not cross-train? must you not cross-train? must they not cross-train?
V-ing form
must I not be cross-training? must you not be cross-training? must he not be cross-training? must we not be cross-training? must you not be cross-training? must they not be cross-training?
Perfect
must I not have cross-trained? must you not have cross-trained? must he not have cross-trained? must we not have cross-trained? must you not have cross-trained? must they not have cross-trained?
V-ing perfect
must I not have been cross-training? must you not have been cross-training? must he not have been cross-training? must we not have been cross-training? must you not have been cross-training? must they not have been cross-training?