The Verbals of the transitive verbs have special formsfor the Active and the Passive voice.
Infinitive
We can send the letter right now. – Indefinite Active
The letter must be sent right now. – Indefinite Passive
Participle I
The girl looked at us as if asking for help. – Indefinite Active
Being asked for help she will never refuse. – Indefinite Passive
Gerund
I like listening to this man. – Indefinite Active
This man likes being listened to. – Indefinite Passive