English verb conjugation
MUST CROSS-TRAIN

Regular verb: cross-train - cross-trained - cross-trained

Affirmation

Simple form	V-ing form
I must cross-train you must cross-train he must cross-train we must cross-train you must cross-train they must cross-train	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	V-ing 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	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	V-ing form
I mustn't cross-train you mustn't cross-train he mustn't cross-train we mustn't cross-train you mustn't cross-train they mustn't cross-train	I mustn't be cross-training you mustn't be cross-training he mustn't be cross-training we mustn't be cross-training you mustn't be cross-training they mustn't be cross-training
Perfect	V-ing perfect
I mustn't have cross-trained you mustn't have cross-trained he mustn't have cross-trained we mustn't have cross-trained you mustn't have cross-trained they mustn't have cross-trained	I mustn't have been cross-training you mustn't have been cross-training he mustn't have been cross-training we mustn't have been cross-training you mustn't have been cross-training they mustn't have been cross-training

Interrogative form

Simple form	V-ing 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?	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	V-ing 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?	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	V-ing form
mustn't I cross-train? mustn't you cross-train? mustn't he cross-train? mustn't we cross-train? mustn't you cross-train? mustn't they cross-train?	mustn't I be cross-training? mustn't you be cross-training? mustn't he be cross-training? mustn't we be cross-training? mustn't you be cross-training? mustn't they be cross-training?
Perfect	V-ing perfect
mustn't I have cross-trained? mustn't you have cross-trained? mustn't he have cross-trained? mustn't we have cross-trained? mustn't you have cross-trained? mustn't they have cross-trained?	mustn't I have been cross-training? mustn't you have been cross-training? mustn't he have been cross-training? mustn't we have been cross-training? mustn't you have been cross-training? mustn't they have been cross-training?