Final answer:
To combine the given sentences into one with a relative clause: “Our real estate agent, who came highly recommended, was able to sell our condominium in just over a week.”
Additionally, punctuation rules for commas include using them before conjunctions separating independent clauses or after an introductory phrase, and omitting them when two actions share the same subject or in a simple list.
Step-by-step explanation:
To combine the sentences “Our real estate agent came highly recommended” and “She was able to sell our condominium in just over a week” into a sentence with a relative clause, you can write: “Our real estate agent, who came highly recommended, was able to sell our condominium in just over a week.”
The word “who” serves as the relative pronoun beginning the relative clause, which provides additional information about the real estate agent without starting a new sentence.
When revising sentences with commas, consider the following correctly punctuated sentences:
- 1. I finally found my keys, and I got to work just in time.
- 2. Mrs. Contreras threw out her old coffee table and cleaned the carpet.
- 3. Taking the elevator to the roof, we hoped we could see the skyline and the bay.
- 4. Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.
- 5. I let my neighbor borrow my phone because she said hers was tapped by the police.
Commas before conjunctions such as “and” are used when they separate independent clauses, and not when they separate items in a list or two actions by the same subject.