Read each sentence and decide whether commas are used correctly. Winter, spring summer and fall are all beautiful when you live in southern California. Lena's favorite sports are tennis swimming, and soccer. Steve, Marco, and Harvey went to the library. I went to the post office, the pharmacy and the grocery store.

The use of commas was incorrect.

Explanation:

The use was incomplete. There need to be more commas to separate nouns in a group, like this:

Winter, spring, summer, and fall are all beautiful when you live in southern California. Lena's favorite sports are tennis, swimming, and soccer. Steve, Marco, and Harvey went to the library. I went to the post office, the pharmacy, and the grocery store.

1. incorrect

2. incorrect

3. correct

4. incorrect

Explanation:

Got it right on edge.