what is the prepositional phrase of this?

That coral reef may have been growing for a thousand years.

The preposition is "for."

The prepositional phrase is "for a thousand years."

I urge you to print this site and use it to help you find prepositional phrases.

http://www.chompchomp.com/terms/preposition.htm

To identify the prepositional phrase in the given sentence, you need to first understand what a prepositional phrase is. A prepositional phrase consists of a preposition, an object, and any modifiers of the object.

In the given sentence, the prepositional phrase is "for a thousand years." Here's how you can identify it:

1. Locate the preposition: In this case, the preposition is "for."
2. Identify the object: The object of the preposition is "a thousand years."
3. Check for any modifiers: In this case, there are no modifiers.

Therefore, the prepositional phrase in the given sentence is "for a thousand years."