Answer:
I suggest listing the digital sources you're asking about so people know what exactly you're referring to and can help you easier with this.
I believe that your answer is:<span> Marcus and his friend see darkening clouds, and they feel drops of rain.</span>
<span>A grouping of words that acts like a single unit inside a sentence but that does not contain both a subject and a verb is called a B. phrase. Phrases do not have subjects or verbs - they are just a couple of words grouped together that are considered a single unit that cannot be separated. For example, "that young boy" is a noun phrase. A clause and a sentence has a verb and a subject. An apostrophe is just a punctuation mark ('). </span>