Missing Comma Before a Question Tag

When we have a statement which we want someone to agree with, we add a few words on the end, turning it into a question. These few words are called question tags. These are words like isn’t it/he/she, or right, or even yes or no. These question tags should be separated from the main clause by a comma.

The citizens of the world all want clean water do drink, do they not?

Do they not is a question tag. It needs to be separated from the statement by a comma.

Legends about werewolves, vampire and other monsters from are considered to be some of the scariest stories around, no?

Those willow trees are beautiful, aren’t they?

That movie was really good, yeah?

Sometimes there will be a linguistically unintelligible question tag. These tend to differ from country to country. These are not likely to be used in formal writing, but they should still be considered when writing informally. Here’s an example that is purely Canadian:

Do you wanna go snowboarding today, eh?