The superlative form is usually formed by adding an "est" to the adjective. When an adjective has more than one syllable, the comparative and superlative forms are made by adding "more" (comparative) or "most" (superlative) in front of the adjective.
The sentence that has the correct subject-verb agreement is the last one:
Saturn, along with Jupiter and Uranus, has rings that encircle the planet.
In the first sentence, it should be - have several...
In the second sentence, it should be - rotates every...
<span>It promises the scope, purpose, and direction of the essay.
If I wrote an essay on vegetarianism, I would discuss why meat is bad for you. You gotta have a purpose when writing an essay.</span>
