How does the alliteration in line 6 affect the poem's tone? It creates an elusive tone that emphasizes how foreign the moon is. It creates a harsh tone that emphasizes the brightness of the moon. It creates a soft and tranquil tone that emphasizes the moon's quietness. It creates a sinister tone that emphasizes the eeriness of the moon.

The alliteration affects the poem's tone because:

It creates a soft and tranquil tone that emphasizes the moon's quietness.

Explanation:

This is the poem we are analyzing:

All up and down the dunes,  

the tall green grasses dance,

as the wind plays lively tunes

across the sandy expanse.

But the moon above is a statue,

silent and somber and still,

its reflection on the sea is a tattoo,

that we watch from upon the hill.

To answer this question, we must pay attention to both to the alliteration itself and the general message of the poem, otherwise we might be tempted to choose the option that says the moon is eerie and sinister.

Notice that, in line 6, the alliteration consists of the repetition of the phoneme /s/. This phoneme is often used to convey softness and quietness, or even a sense of soothing.

Besides that, the two stanzas of the poem contrast with each other. The first one describes a lively scene, filled with movement. The second one, on the other hand, emphasizes how quiet, how still the moon is. While the grasses dance and the wind sings, the moon remains silent.

For that reason, the best option is: It creates a soft and tranquil tone that emphasizes the moon's quietness.

it is an infinitive phrase with a subject.

wood chucks can't chuck wood so no wood