1. Present Progressive: (am/is/are + verb + -ing) - *I am eating.*
2. Past Progressive: (was/were + verb + -ing) - *We were playing.*
3. Future Progressive: (will be + verb + -ing) - *They will be sleeping.*
4. Present Perfect Progressive: (have/has been + verb + -ing) - *She has been working.*
Note: The "Present Perfect Progressive" is sometimes referred to as the "present perfect continuous" depending on the style guide being followed.