Do you put a comma before the word until?

You don't always put a comma before "until." It depends on the sentence structure:

1. "Until" as a Preposition:

* When "until" acts as a preposition (introducing a phrase that modifies a verb), a comma is not needed.

* Example: He worked until midnight.

2. "Until" as a Conjunction:

* When "until" acts as a conjunction (connecting two independent clauses), a comma is needed before it.

* Example: We stayed at the beach all day, until the sun began to set.

3. "Until" in Complex Sentences:

* If "until" introduces a dependent clause (one that can't stand alone as a sentence), a comma is usually not needed.

* Example: I will wait here until you return.

Important Note:

* The presence or absence of a comma before "until" can affect the meaning of the sentence. It's important to carefully consider the sentence structure and how "until" is functioning within it.