Forms of infinitive (Формы инфинитива)
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Active Passive
Indefinite to + V
to work, to send
to  be  +3fV
to be worked, to be sent
Continuous to  be + Ving
to be working,
to be sending
Perfect to  have + 3fV
to have worked,
to have sent
to have been +3fV
to have been worked,
to have been sent
Perfect Continuous to have been + Ving
to have been working,
to have been sending