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Interactive Grammar: Complex Embedded Clauses

Produce and interpret deeply embedded clause structures in formal written and academic English.

Grammar Explanation · Authentic Examples · Practice Exercises

Lesson progressNot started
Duration
~36 min
Exercises
24
Level
Mastery

Overview

Produce and interpret deeply embedded clause structures in formal written and academic English.

Deep Embedding

  • SingleThe report [that the committee submitted] was approved.
  • DoubleThe report [that the team [who won the contract] produced] was praised.
  • Nominal[What the data reveals] is [that behaviour changes when observed].
  • RuleIdentify the MAIN verb — it belongs to the outermost clause.

Types of Embedding

  • Relative clause: the fact [that X holds], the claim [which Y defended]
  • Nominal clause: [What concerns experts] is [whether the trend persists]
  • Reported embedding: She suggested [that the findings indicated [that X was possible]]
  • Academic prose regularly uses 2–3 levels of embedding.

Agreement Trap

  • Find the main subject — not the nearest noun.
  • ❌ The team of researchers who worked on this were → ✅ was awarded the grant.
  • Three levels of embedding is typically the readable limit in formal prose.

When to use

Academic prose

The assumption that the data supports the model has been contested.

Legal language

The clause providing that the party who breaches the agreement shall...

Scientific writing

The evidence suggesting that the compound isolated has therapeutic properties is preliminary.

Journalism

The politician whom the committee that oversees the inquiry named...

Complex Embedded Clauses: Multiple Choice

Parse the complex sentence and answer correctly

Multiple Choice10 questions
1What is the main verb in: 'The report that the team submitted was approved'?
2The subject controlling the main verb in: 'The cost of the revisions was high':
3What type of clause is [what the data reveals] in: '[What the data reveals] is significant'?
4How many levels of embedding in: 'The claim that the findings the committee reviewed were falsified'?
5Correct subject-verb agreement in: 'The team of analysts who reviewed the data ':
6What is embedded in: 'She suggested that the results indicated that the treatment worked'?
7The phrase 'the assumption that the data supports the model' contains:
8Correct verb in: 'The researcher whose methodology the panel that oversees the project challenged':
9Which sentence is too deeply embedded to be clearly understood?
10A nominal clause can function as:

Identify and Complete the Structure

Fill in the correct word to complete each embedded clause structure

Fill in the Blanks8 questions
1The assumption(connector)the model is valid has been challenged.
2What concerns(wh-nom subject)is whether the trend will continue.
3The team of researchers who worked on this(main verb agree)awarded the prize.
4She claimed(that + embedding)the evidence indicated that no harm had occurred.
5The fact(connector)no one objected was itself remarkable.
6The proposal(which + passive)was rejected by the board, had considerable merit.
7Whether the model(embedded Q-word)remains applicable is a matter of ongoing debate.
8The evidence suggesting(that-clause)the compound has therapeutic properties is preliminary.

Combine Using Embedded Clauses

Join these two sentences using an embedded nominal or relative clause

Transform6 questions

1Something concerns experts. Will the trend continue? (What concerns / nominal)

2The committee made an assumption. The data supports the model. (the assumption that…)

3She claimed something. The findings indicated something. No risk existed. (nested that-clauses)

4The researchers received an award. They had worked on the project. (who + defining RC)

5Nobody objected. This itself was remarkable. (the fact that…)

6The policy has significant implications. The board introduced it. (relative clause + embed)

Frequently Asked Questions

What does this lesson on clauses cover?

Produce and interpret deeply embedded clause structures in formal written and academic English.

Which CEFR level is this lesson designed for?

This lesson is designed for Mastery (C2) learners and forms part of the Clauses section on Grammartier.

What is the best approach for studying this grammar topic?

Start with the definition, then study the examples carefully to understand how the pattern works in context. Practise identifying the structure in authentic sentences before producing your own — this recognition-first approach builds a strong foundation for accurate, confident use.