Parallel Structure

Two 'l's in the middle

No 'l's

Two 'l's at the end

Two 'l's at the start

Grammar rules

Stylistic harmony

Vocabulary expansion

Punctuation accuracy

Because it's not taught in schools

Because it's a recent concept

Because it's optional

Because it deals with sentence harmony

I love to fish, skiing, and rock climbing.

I love fishing, skiing, and rock climbing.

I love fishing, skiing, and to climb rocks.

I love fishing, to ski, and climbing rocks.

Using only gerunds

Mixing verb forms

Avoiding passive voice

Keeping a consistent style

It limits the writer's expression

It focuses on grammatical accuracy

It creates a stylistic harmony

It complicates the sentence structure

They are less preferred than infinitives

They help maintain consistency when used in a list

They can be mixed with infinitives

They should be avoided

The cake baked, frosted, and was sprinkled.

The cake was baked, frosted, and I put sprinkles on it.

The cake was baked, frosted, and sprinkled.

The cake baked, frosted, and I put sprinkles on it.

They should be mixed for variety

They should be used interchangeably

They should not be mixed within the same list

They have no impact on structure

Be cautious when mixing short adjectives and longer phrases

Only phrases should be used for emphasis

Only adjectives should be used for clarity

Adjectives and phrases should be mixed