'Determining the crime and the likelihood of a repeat offense should be the prosectutors' criteria in deciding how they try these young adults.'
Could you, please, name the parts of this sentence.
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Here is my attempt:
Determining the crime and the likelihood of a repeat purchase= gerund phrase acting as the subject
should= auxillary verb
be= main verb
the prosectutor's criteria in deciding how they try these young adults= Noun phrase and prepositional phrase acting as object of the verb to be
How is this? Correct?
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Any further anlysis would be great help, too.

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Also, alhough I know the object of this sentence is not a clause, I would just like to know why not. Why can't
try be the main verb in this sentence?
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Thanks.