Punctuation with complex clauses

## Level and focus

**Level:** B2  
**Category:** Writing grammar

Use commas with introductory clauses, non-defining relatives and complex clause structures.

By the end of this lesson, learners should be able to: **Choose punctuation that reflects clause type and sentence structure in B2 writing.**

## Core idea

This lesson adds a recommended grammar point that improves the coverage of the curriculum without changing the overall CEFR progression. Learners should first recognise the pattern, then practise controlled examples, and only later combine it with adjacent grammar.

## Form

- `comma after many introductory clauses`

• commas around non-defining relative clauses

• no comma before defining relative clauses in normal cases

• comma after fronted contrast/linking expressions

  Meaning and use

  Use this grammar when the speaker needs the meaning described in the lesson goal. The examples should stay close to the level and should not rely on advanced vocabulary or several new grammar points at once.

  Examples

  • Although it was raining, we went out.

• My brother, who lives in Seville, is visiting us.

• The woman who lives next door is a doctor.

• However, the results were disappointing.

  Common mistakes

  • Using commas in defining relatives: not The book, that I bought, was expensive; use The book that I bought was expensive.

• Omitting commas in non-defining relatives: not My sister who lives in London is a doctor; use My sister, who lives in London, is a doctor.

• Forgetting a comma after a long introductory clause: not Although the test was difficult we passed; use Although the test was difficult, we passed.

  Teaching sequence

  1. Start with a clear contrast between two forms or meanings.
  2. Give short controlled examples with familiar vocabulary.
  3. Include one item that targets a common mistake.
  4. Add mixed review items that distinguish this point from a neighbouring lesson.
  5. End with simple sentence-level production or recognition.

  Boundary: what not to cover here

  Keep punctuation tied to grammar structures, not to a full punctuation course.

  Suggested practice

  For the current exercise system, use 25 multiple-choice exercises. Include clear distractors that test the target grammar, not obscure vocabulary. Later, this lesson can be expanded with gap-fill, error-correction or transformation tasks.

Quick check

Before you move on, can you explain the rule in one sentence and make one example of your own?