鉛筆

鉛筆

Pencil.

Here, '鉛筆' (enpitsu) is used to indicate a physical object, specifically a writing tool, in the context of a purchase.

私は新しい鉛筆を買いました。

I bought a new pencil.

'鉛筆' (enpitsu) here refers to the writing instrument, describing the medium used to write the letter.

鉛筆で手紙を書きました。

I wrote a letter with a pencil.

In this sentence, '鉛筆' (enpitsu) is the subject, describing its location as being on a desk.

机の上に鉛筆が落ちています。

A pencil is lying on the desk.