Помогите пожалуйста. Participle 2,Participle, Gerund

  • Укажите грамматическое явление в выделенном слове: Participle 2,Participle, Gerund
    1) (The closed) throttle means that a fairly significant vacuum occurs behind the closed butterfly valve.
    2) If the float drops, the inlet is opened (allowing) the fuel to flow under the fuel pump's pressure.
    3) The crank mechanism is a device for (converting) the in-and-out motion of the piston to rotating motion of the crank shaft.

  • (The closed) throttle Participle 2; (allowing) the fuel Participle 1; a device for (converting) Gerund

  • Спасибо)