Select all of the sentences that demonstrate correct parallel sentence structure.

1, 2, 4.

Explanation:

To answer this question, you must first understand what parallelism is. In English, we always have to keep our writing consistent and concise, and this is what parallelism is very good for. When you're writing a sentence that lists certain things, you have to keep them consistent—and this can mean listing all nouns, all verbs in the same part of speech, all adjectives, or all adverbs.

WRONG example: I like to eat, sleeping, and breathe.

RIGHT example: I like to eat, sleep, and breathe. or: I like eating, sleeping, and breathing.

WRONG example: She is tall, pretty, and confidence.

RIGHT example: She is tall, pretty, and confident.

Hope this helps! :)