The sentence that correctly uses an apostrophe is:
3. Phillip's car broke down on the highway.
Explanation:
1. "Pams plates' have been washed and put away." - Incorrect: The apostrophe should be before the "s" to indicate possession for a singular noun. It should be "Pam's plates" instead of "Pams plates'."
2. "Penelopes' children are staying over tonight." - Incorrect: The apostrophe should be after the "s" to indicate possession for plural nouns. It should be "Penelopes' children" only if there are multiple Penelopes. If referring to one Penelope, it should be "Penelope's children."
3. "Phillip's car broke down on the highway." - Correct: This sentence correctly uses an apostrophe to show possession. The car belongs to Phillip, so the apostrophe is correctly placed before the "s."
4. "Papas tacos' are the best I've ever tasted." - Incorrect: The apostrophe should be before the "s" to indicate possession for a singular noun. It should be "Papa's tacos" instead of "Papas tacos'."
In summary, option 3, "Phillip's car broke down on the highway," is the sentence that uses an apostrophe correctly to show possession.