Final answer:
The incomplete sentence provided can be revised for clarity and correctness. Additionally, several review questions were addressed, amending and explaining comma usage within different sentence structures.
Step-by-step explanation:
The sentence, 'Although Mary has been my best friend for 10 years' requires completion to be grammatically correct. It can be revised to 'Although Mary has been my best friend for 10 years, we have had our share of disagreements.'
Review Questions
1. 'I finally found my keys and got to work just in time.' There is no need for a comma as it's a compound predicate not a compound sentence.
2. 'Mrs. Contreras threw out her old coffee table and cleaned the carpet.' The comma is not needed before the conjunction 'and' as it joins two verbs related to the same subject.
3. 'Taking the elevator to the roof, we hoped we could see the skyline and the bay.' This sentence is correct with the comma after the introductory phrase.
4. 'Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy.' Here, a comma is used after the dependent clause and before the series of nouns.
5. 'I let my neighbor borrow my phone because she said hers was tapped by the police.' The sentence does not require a comma because the reason provided by the clause is essential to the meaning of the sentence.