Example:

1. They collected 10000 signatures on the petition.

They? Collected 10 000 signatures for their petition.

I'm collecting donations for next week's fund-raising competition.

I am? Solicit sponsors for next week's charity run.

The city Council is collecting tenants under 25 who are willing to spend three to five hours a week with their neighbors.

The city Council is seeking applications from renters under the age of 25 who are willing to spend three to five hours a week with their elderly neighbors.

We recruited them as conference ushers.

We invited them as ushers in the meeting.

5. Notice of writing is being sent out one after another.

A notice to purchase paper is being issued now.