word choice - have to / must / should / ought as applied to inanimate objects


have to
must
should
ought


I found a lot of examples with explanations on using this words applying to people, but not to inanimate objects. In the case of inanimate objects, such explanations as “obligatory”, “moral correctness”, “advise” etc. does not work.
What the verbs should be used in the next sentences?


The car _______ turn when the driver turns the steering wheel.
The car _______ not start moving spontaneously.
The (computer) program _______ solve the equation.
If an error occures, the program _______ indicate a message.


I think, different variants are possible and they have different meanings.




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