Reducing adverb clauses is one of the most effective ways to simplify and strengthen your grammar on the TOEFL iBT. In both the speaking and writing sections, native-like sentence variety is rewarded. One strategy high-scoring test-takers use is reducing adverb clauses to create smoother, more concise responses.

Why Reducing Adverb Clauses Helps on the TOEFL

When TOEFL raters evaluate your grammar, they’re looking for:

• Structural variety
• Advanced grammar control
• Concise, natural-sounding sentences

Reducing adverb clauses is an advanced skill that lets you transform dependent clauses into modifying phrases. It shows you understand how English works at a high level—and helps you avoid choppy or overly wordy writing.

How to Reduce Adverb Clauses

Let’s explore five major patterns.

1. Reducing Adverb Clauses of Time

Adverb clauses that begin with "after," "before," "while," and "when" can usually be reduced if the subject of the main and dependent clauses is the same.

2. Reducing Adverb Clauses Showing Cause/Effect

Adverb clauses beginning with "because," "since," or "as" can also be reduced by removing the subject and auxiliary verb.

3. Position and Punctuation of Reduced Adverb Clauses

You can place reduced adverb clauses at the beginning or end of the sentence. When they come first, use a comma.

4. Reduced Adverb Clauses with Emotive Verbs

Some clauses express emotions like surprise or regret and can be reduced using participial phrases.

5. Avoiding Dangling Participles

Always make sure the subject of the main clause is the same as the reduced clause. Otherwise, you’ll create a “dangling participle.”

5 Practice Questions: Reducing Adverb Clauses

Choose the answer that most correctly completes the sentence using reduced adverb clause structure.

1. 1. _____ the lecture, the students asked questions. a) Finished b) After finishing c) After they finish d) To finish
   2. _____ tired, he went to bed early. a) Being b) Be c) Because he is d) Is
   3. She fell asleep _____ for the exam. a) studied b) studying c) because studying d) after she studies
   4. _____ a professional chef, he cooked the meal quickly. a) Been b) Be c) Being d) Was
   5. _____ to the store, I realized I forgot my wallet. a) Went b) Going c) Because I go d) Having go

Answer Key

1. 1. b) After finishing
   2. a) Being
   3. b) studying
   4. c) Being
   5. b) Going

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