[SmG Venus]

Syntax is the way words and phrases are arranged. So like if you were trying to describe a ball that was blue and very large, you would say "the large blue ball" instead of " the blue large ball" or if you're talking about a person doing a thing it would be subject + verb + object receiving the action i.e. "Venus posted on the forum"

So I assume by syntax essay they are just expecting an essay where you are mindful of the order you write the words

Okay thanks, its for AP english language and comp so ya.