[1] Marco was searching for a way to help the cafeteria reduce the amount of trash it produced every day. [2] He suggested composting. (3) Marco's homeroom teacher thought composting was a great idea. [4] A dedicated environmentalist himself. (5) Marco wrote a proposal. [6] A
few days later, he presented his proposal to the principal. [7] Within a month, the cafeteria was composting leftover food,
Which sentence in the passage is a sentence fragment?
1. sentence 2
O 2
sentence 3
O 3
sentence 4
4. sentence 5

The sentence in the passage that is a sentence fragment is sentence 4.

Explanation:

We can define fragment as a group of words that initially looks like a sentence but that lacks something essential in order to make sense. A fragment can lack, for instance, the subject, or even the predicate.

That is the case with sentence 4: "A dedicated environmentalist himself." What about him? There is no verb, no predicate, nothing. This fragment could become a subject if we added a proper predicate after it. Or, maybe, it is supposed to be an absolute phrase - a phrase that modifies the sentence that follows. But, the way it is now, sentence 4 makes no sense.

A possibility would be replacing the period with a comma and connecting sentences 4 and 5. Notice how that makes more sense:

- A dedicated environmentalist himself, Marco wrote a proposal.