What are the parts of speech in phrase when it rains?

Here's a breakdown of the parts of speech in the phrase "when it rains":

* when: Subordinating conjunction - It introduces a dependent clause (a clause that cannot stand alone as a sentence).

* it: Pronoun - Represents the subject of the verb "rains."

* rains: Verb - Indicates the action of the sentence.

The entire phrase "when it rains" is a dependent clause. It relies on an independent clause to form a complete sentence. For example:

* When it rains, I stay inside. ("When it rains" is the dependent clause, and "I stay inside" is the independent clause.)