Помогите пожалуйста с активным и пассивным залогом

  • Укажите состояние и время сказуемого (active or passive)
    1) The compression stroke takes place, when both valves are closed.
    2) The piston must be connected to a mechanism, which controls it's sliding.

  • 1) The compression stroke( takes )---Present simple active place, when both valves (are closed.)--present simple passive
    2) The piston( must be connected)--passive with modal must and simple infinitive to a mechanism, which (controls )---present simple active sit's sliding.

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