toshokan de wa koe o sagete kudasai.

topic particle

Breakdown of toshokan de wa koe o sagete kudasai.

• を: direct object particle
• で: location particle
• 図書館としょかん: library

Questions & Answers about toshokan de wa koe o sagete kudasai.

Why is 図書館で used here instead of 図書館に?

In Japanese, で marks the location where an action takes place. Lowering your voice is an action, so we use 図書館で (“at/in the library”). If you used に, it would more often indicate a destination or existence (“to the library” or “in the library” for a stative verb), which doesn’t fit here.

What’s the function of the は in 図書館では?

Here では combines two particles: で (location of action) + は (topic marker). By saying 図書館では, you set “in the library” as the topic or context (“As for in the library…”), highlighting that this rule applies specifically there.

Why is 声を下げてください used instead of 声を小さくしてください or other verbs?

• 声を下げる literally means “to lower one’s voice,” a common set phrase for speaking more quietly.
• 声を小さくする (“make your voice small”) is understandable but less idiomatic.
• Other verbs like 声を抑える or 声を潜める have nuances of suppressing or whispering and may sound more formal or literary.

What kind of request form is 〜てください?

〜てください is the polite imperative/request form. You take the て-form of a verb (here 下げる → 下げて) and attach ください, turning it into “please do ….” It’s softer than the plain imperative (下げろ).