10. Identify the incorrectly punctuated sentence.
a. Most of my friends, even CiCi, are excited about the spring play.
b. Memorizing a monologue is challenging.
c. Even with help, I still struggle with a few lines in mine.
d. Jason gets stage fright so he decided not to audition for the play.
11. Identify the incorrectly punctuated sentence.
a. You must return your first rental, before they will send you another movie.
b. If you cleaned your room, maybe you would be able to find the DVD.
c. Let’s clear out the trash, clothes, and soda cans.
d. Yes, I found the DVD under the big pile of laundry by your bed.
12. Which sentence contains an incorrect end mark?
a. Look at the prices on these shirts!
b. I know how much they usually cost?
c. Have you been in this shop before?
d. I want to go somewhere less expensive.
13. Identify the correctly punctuated sentence. (1 point)
a. Doing my homework, making my bed, and practicing guitar are on my to-do list for the day.
b. Doing my homework, is the first thing I should do.
c. Doing my homework I found my mind start to drift.
d. Doing my homework, and making my bed are the things I don’t want to do.

When the coordinating conjunction so is linking two independent clauses (clauses that can stand alone and have full meaning), a comma is necessary. This is also true for other coordinating conjunctions like and, but, for, or, nor, yet, etc.

Independent clause 1: Jason gets stage fright and 2: He decided not to audition for the play.

11. a. You must return your first rental, before they will send you another movie.

When the preposition before is placed at the middle of a sentence and it is not an appositive phrase, it should not be preceded by a comma. In this sentence, there should not be a comma. Now, if the preposition was placed at the beginning of the sentence, it requires a comma, for example: Before they send you another movie, you must return your first rental.

12. b. I know how much they usually cost?

This is a statement and not a question (it does not begin with an auxiliary verb such as do, be, have), thus the question mark there is misplaced here.

13. a. Doing my homework, making my bed, and practicing guitar is on my to-do list for the day.

This sentence is correct as it is using the commas to separate more than two items or activities in a sentence, which is one of the many functions of a comma.