1. He got up early and he got ready for the game.

2. He got up early, getting ready for the game.

3. He got up early and got ready for the game.

4. He got up early getting ready for the game.

(What about those changes? Which of them are grammatical?)

They are all grammatically correct.'

Sra

However, 2 is better than 4.

All four sentences you provided are grammatically correct, but they differ slightly in terms of punctuation and word choice. Let's break them down to understand their differences:

1. "He got up early and he got ready for the game."
In this sentence, there are two separate clauses connected by "and." The repetition of the subject pronoun "he" is an example of parallel structure, which adds clarity to the sentence.

2. "He got up early, getting ready for the game."
This sentence uses a comma to set off the participial phrase "getting ready for the game." The omission of the second "he got" makes the sentence more concise.

3. "He got up early and got ready for the game."
Similar to the first sentence, this one uses parallel structure but omits the repetition of the subject pronoun. The conjunction "and" connects the two verbs, indicating a sequence of actions.

4. "He got up early getting ready for the game."
This sentence also omits the repetition of the subject pronoun, but differs from the other sentences by eliminating the conjunction "and." Instead, it uses the participial phrase "getting ready for the game" directly after the verb "got up early."

In terms of grammar, all four sentences are correct. The choice between them would depend on the desired style, emphasis, or rhythm of the sentence.