1. We have supported the local shelter for five years.

• We began supporting the local shelter five years ago.

2. How long have you volunteered at the community kitchen?

• When did you start volunteering at the community kitchen?

3. When did you start helping at the youth center?

• How long have you been helping at the youth center?

4. It's four months since we last donated food to the shelter.

• We haven't donated food to the shelter for four months.

5. The last time he volunteered at the food bank was in May.

• He hasn't volunteered at the food bank since May.

6. We began cleaning up the riverbanks three years ago.

• We have been cleaning up the riverbanks for three years.

7. She hasn't led a charity run since last summer.

• The last time she led a charity run was last summer.

8. When did we begin donating clothes to the shelter?

• How long have we been donating clothes to the shelter?