The cars passing by are filled with commuters.

which of the following are NOT true?

the sentence includes a present participle
the participle phrase modifies the word commuters ***
the participle phrase is essential. no commas are needed
the participle phrase is passing by

B is correct!

To determine which of the options is NOT true, we need to analyze the sentence:

"The cars passing by are filled with commuters."

1. "The sentence includes a present participle": This is true. The present participle in this sentence is "passing."

2. "The participle phrase modifies the word commuters": This is true. The participle phrase "passing by" describes the cars and tells us what the cars are doing.

3. "The participle phrase is essential. No commas are needed": This is true. In this sentence, the participle phrase "passing by" is necessary to clarify the action of the cars. Omitting it would change the meaning of the sentence.

4. "The participle phrase is passing by": This statement is NOT true. The phrase "passing by" is indeed the participle phrase in this sentence.

Therefore, the option that is NOT true is: "the participle phrase modifies the word commuters."