Comma splices: Grammar’s Siamese twins

Earlier this week, I published at my PenPrompts blog a writing prompt template to use to get students to define some class concept concretely.

We English teachers are particularly poor at identifying concepts whose meanings:

  • Are obsolete outside English class
  • We ourselves don’t really understand

I once overheard a retired English teacher telling someone about failing the exam her college required of all prospective teachers.

The teacher, whom I will call Susan, said the exam included an essay question. Susan said the graders failed her for having comma splices. They made her retake the exam.

The person to whom Susan was telling her story asked, “What’s a comma splice?”

Susan said, “Oh, I don’t know. It’s using lots of commas or something.”

After more than two decades teaching English, Susan had never learned:

  • The function of a comma is to separate grammatical elements.
  • To splice means to join elements by overlapping them.

A comma splice joins two sentences with a device for separating grammatical elements.

That is unnatural.

It’s weird.

Comma splices are grammatical freaks.

Comma splices are the Siamese twins of grammar. 

conjoint twins are metaphor for comma splices

Old photo of Siamese Twins

You can prevent your students from falling into creating grammatical freaks.

First, when you use a 12th century grammatical term, explain it for students or use a 21st century term instead of the textbook term—even if you have to invent a term.

Then have students explain the term by writing an original sentence and explaining which word(s) in their sentences performs the grammatical function you are trying to teach them.

When you use informal writing to provide informal assessment of students’ knowledge, they will soon teach you which terms mean something different to them than they do to English teachers.

Students’ misunderstandings should also teach you what to say instead of using the misunderstood term.

Thanks to students’ misunderstandings, I taught myself to say “grammatical subject of the sentence” and to distinguish it from “the conversational subject of the sentence.”

To sum up:

  • Use terms students understand.
  • Use informal writing to find out what students misunderstand.
  • Don’t let students go though life creating grammatical freaks.

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