Question

Which sentence is punctuated correctly? Can someone check my answers?

A. Be careful David, or you'll slip on the ice. ***
B. Be careful, David or you'll slip on the ice.
C. Be careful, David, or you'll slip on the ice.
D. Be careful David or you'll slip, on the ice.

A. Some bright objects in the night sky are far-away suns, others are local planets. ***
B. Some bright objects in the night sky are far-away suns; others are local planets.
C. Some bright objects in the night sky are far-away suns, astronomy is a science.
D. Some bright objects in the night sky are far-away suns; astronomy is a science.

A. Commonly used coins include: pennies, nickels, dimes and quarters.
B. Commonly used coins include: pennies, nickels, dimes, and quarters.
C. Here are some commonly used coins: pennies, nickels, dimes and quarters.***
D. Here are some commonly used coins; pennies, nickels, dimes and quarters.

Answer 1

1. A

2. A

3. B

Looks like you were correct on all but number 3. Good job! :)

Answer 2

A, A, B, are the answers.

Step-by-step explanation:

For this question, it is necessary to remember some of the rules for commas (according to Gram.arbook:)

1) In sentences where two independent clauses are joined by connectors such as and, or, but, etc., put a comma at the end of the first clause, which explains question number one.

2) Use commas to set off expressions that interrupt the sentence flow by using the word other.

3)Use commas to separate words and word groups in a simple series of three or more items: this rule applies for the third question, since it is also necessary to used it before the connector and.