Academic Thesis Passive Voice Usage: When to Use, Why Use, How to Use
Passive voice is frequently used in academic thesis. This guide explains when to use passive voice, why use it, and common mistakes, helping you master academic writing style.
What this page helps you do first
- Passive voice timing judgment
- Active to passive conversion
- Chinese and English passive differences
Why academic thesis prefer passive voice
Academic writing emphasizes objectivity, minimizing subjective pronouns like "I", "you", "we". Passive voice shifts focus to the research subject and process rather than the actor.
STEM papers especially favor passive voice, like "results show..." instead of "we found...". But humanities and social science papers increasingly accept active voice, especially when emphasizing author positions.
When to use passive voice
- When emphasizing experimental subject or results: "50 patients were randomly divided into two groups"
- When the actor is unimportant or unknown: "This method was first proposed in 1990"
- Formal writing requiring objective academic tone
- Methods sections typically use passive voice heavily
When to avoid passive voice
- When you need to clearly identify the actor, active voice is more direct
- When emphasizing your own viewpoints or judgments, active voice is more powerful
- When sentences are already long, passive voice adds reading burden
- In results discussion, sometimes "we believe" adds author stance
Passive voice conversion tips
- "We conducted the experiment" → "The experiment was conducted"
- "Researchers found..." → "...was found by researchers"
- "Figure 2 shows the data" → "Data is shown in Figure 2"
- "A causes B" → "B is caused by A"
Chinese and English passive voice differences
Chinese uses passive voice far less frequently than English. Chinese tends to use markers like the character for passive (bei), or directly use active voice. Forcing passive voice in Chinese thesis makes it sound stiff.
English thesis can use passive voice more freely, but excessive use affects readability. English thesis should use passive voice mainly in methods and results sections.
Frequently asked questions
- Is passive voice required in all academic thesis?
- No. This depends on disciplinary norms and journal requirements. STEM especially physics, chemistry, biology traditionally use more passive voice; management, education and other humanities increasingly accept active voice. Check author guidelines before submission.
- Does too much passive voice affect readability?
- Yes. Excessive passive voice makes writing sound dull and circuitous. Good academic writing balances passive and active voice. Generally recommend passive voice not exceed 1/3 of total sentences.
- Can English passive sentence structures be used in Chinese thesis?
- Not recommended. Chinese has its own expression habits; forcing English passive structures makes Chinese sound stiff. Chinese thesis can use subject-less phrases like the phrase for "research indicates" to achieve similar effects.