で (means)
by, with, in (tool, transport, language)
Noun + で
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The same で marks how something is done: the tool, the transport, the language. 箸で食べます, "eat with chopsticks"; バスで行きます, "go by bus"; 日本語で話しましょう, "let's talk in Japanese".
It's a different job from "at a place", but the two rarely clash, since places and tools don't look much alike.
Two details trip people up:
- On foot is 歩いて, a verb, not 足で.
- "With a person" is と (友達と行きます), never で. で is for things you use, not people you're with.
Examples
毎日バスで会社に行きます。
I take the bus to work every day.
箸で食べます。
I eat with chopsticks.
日本語で話しましょう。
Let's talk in Japanese.
ボールペンで書いてください。
Please write in ballpoint pen.
写真はメールで送ります。
I'll send the photos by email.