Understanding Sentence Structures

 

I. Clause types and uses

1. Relative (adjective) clauses:

Add information about a noun.

• Defining: The student who studies daily improved.
  Clause type: dependent — relative (defining)
• Non-defining: My sister, who lives in Boston, visited.
  Clause type: dependent — relative (non-defining)

2. Adverbial clauses:

Modify verbs (Time, Cause, Condition, Contrast, Manner).

• Time: After we finished, we left.
  clause type: dependent
• Cause: Because she prepared, she passed.
  clause type: dependent
• Condition: If it rains, we’ll cancel.
  Clause type: dependent — adverbial (condition)
• Contrast: Although tired, he kept working.
  Clause type: dependent — adverbial (contrast)
• Manner: He spoke as if he knew everything.
  Clause type: dependent — adverbial (manner)

3. Noun clauses:

Act as subjects, objects, or complements.

• Subject: What you did surprised me.
  Clause type: dependent — noun (subject)
• Object: I know that she lied.
  Clause type: dependent — noun (object)
• Complement: The truth is that he left.
  Clause type: dependent — noun (complement)

II. Reduced (shortened) clauses

1. Reduced relative clauses:

Remove pronoun + be/verb to make concise phrases.

• Full: The man who was standing there smiled.
  Clause type: dependent — relative (defining)
• Reduced: The man standing there smiled.
  Clause type: reduced relative participial phrase

2. Reduced adverbial clauses:

Use participles for time/reason.

• Full: When I finished my work, I went out.
  Clause type: dependent — adverbial (time)
• Reduced: Having finished my work, I went out.
  Clause type: reduced adverbial (participial phrase)

 

III. Reduced-form ambiguity and dangling modifiers

Reduced (participial) phrases must clearly refer to the correct subject. If not, they create ambiguity or a dangling modifier.

1. Dangling modifier — incorrect:

“Running to catch the bus, the book fell from my bag.”

Problem: The participial phrase Running to catch the bus appears to modify the book, which is illogical.
Corrected: Running to catch the bus, I dropped the book from my bag.
Fix: Make the subject of the participial phrase the grammatical subject of the sentence (I), so the modifier attaches correctly.

2. Ambiguous reduced relative — incorrect:

“The woman carrying a baby spoke to the teacher.”

Ambiguity: Is the teacher carrying a baby or the woman?
Clarified: The woman who was carrying a baby spoke to the teacher.
Or: Carrying a baby, the woman spoke to the teacher.
Fix: Use a full relative clause or rephrase the participial phrase placement to remove ambiguity.

IV. Quick punctuation reminder for relative clauses

• Non-defining (extra info) → use commas:
  My car, which I bought last year, is reliable.
• Defining (essential info) → no commas:
  The car that I bought last year needs repairs.

 

V. Practice

1. Identify the clause and its type: “I remember that day.” (Is this a noun clause? object?)
2. Reduce the relative clause: “The students who were selected for the team celebrated loudly.” → rewrite using a reduced relative clause.
3. Fix the dangling modifier: “Hoping to impress the examiners, the results were announced.” → correct the sentence.
4. Decide punctuation: Should there be commas? “My brother who lives in Sydney is a chef.”
5. Choose the correct conditional reduced form: Convert “When he had finished his homework, he went to bed.” into a reduced adverbial form.

 

Answers

1. Clause: “that day” — Not a clause (no verb); probably intended example should be “I remember that he arrived late.” A noun clause must contain subject + verb (e.g., “that he arrived late”) — clause type: dependent — noun (object).
2. Reduced: The students selected for the team celebrated loudly.
   Clause type: reduced relative participial phrase
3. Correction: Hoping to impress the examiners, the students waited for the results.
   Explanation: Make the grammatical subject of the main clause the doer of the participle.
4. Answer: Use commas if the clause is non-defining. If you mean a specific brother among many, no commas: “My brother who lives in Sydney is a chef.” (defining). If you mean the brother (only one) and add extra info, use commas: “My brother, who lives in Sydney, is a chef.” (non-defining)
5. Reduced adverbial: Having finished his homework, he went to bed.
   Clause type: reduced adverbial (participial phrase)