1. offering help
Shall is for making suggestions and offering help
2. offer help
3. Offer assistance
4. come forward
We need witnesses to come forward with information about the attack.
No witnesses to the accident have come forward yet, despite the police appeal. Nobody has yet come forward with any information relating to the girl's death.
English word "oferować pomoc"(come forward) occurs in sets:
crime and punishmentdestination unit 12BBC Learning English