using commas

While they watched the match Anita clapped, cheered, and kept score.

Travis and Nick watched a number of different matches, but Anita followed Fergas.

He was signing autographs, and Anita was first in line.

2 and 3 are correct.

There's one comma missing from the first one.

Jack and Jill watched a bunch of different soccer games, but Riccardo’s favorite was the Valencia Vixens.

While they watched the match, Anita clapped, cheered, and kept score.

Travis and Nick watched a number of different matches, but Anita followed Fergas.

He was signing autographs, and Anita was first in line.

Commas are used to separate different elements in a sentence. In the examples you provided, the commas are used to separate multiple actions or to separate different people or things in a list. Let's break down each sentence:

1. "While they watched the match, Anita clapped, cheered, and kept score."
- In this sentence, there is a list of actions that Anita performed while watching the match: clapping, cheering, and keeping score. The comma after "match" sets off the dependent clause "While they watched the match," from the main clause.

2. "Travis and Nick watched a number of different matches, but Anita followed Fergas."
- This sentence is about two different sets of people doing different activities. The comma before "but" separates the two contrasting clauses. "Travis and Nick watched a number of different matches" is the first part, and "Anita followed Fergas" is the second part.

3. "He was signing autographs, and Anita was first in line."
- This sentence has two separate actions taking place. The comma here is used to separate the two independent clauses. The first clause is "He was signing autographs," and the second clause is "Anita was first in line."

Remember, commas can be used in various ways, including separating items in a list, setting off introductory phrases or clauses, separating independent clauses in compound sentences, and more. It's important to understand the grammar and context of the sentence to determine where commas should be placed.