Here's a breakdown:
* What they express: Ongoing actions, actions happening at a specific time, or actions happening around a specific time.
* How they're formed:
* Present Progressive: `be (am, is, are) + verb + -ing`
* Example: "I am walking to the store."
* Past Progressive: `was/were + verb + -ing`
* Example: "She was reading a book."
* Future Progressive: `will be + verb + -ing`
* Example: "He will be eating dinner later."
Key points to remember:
* Action in progress: The emphasis is on the duration of the action, not its completion.
* Time frame: Progressive tenses often indicate a specific point in time or a period of time.
* Other uses: They can express temporary actions, planned actions, or actions interrupted by another event.
Let me know if you would like examples or more specific information on how to use progressive verb forms!