Particle indicating location where an action takes place (at; in).
図書館で本を借りました。
I borrowed a book at the library.
公園で子どもたちが遊んでいる。
Children are playing in the park.
家で夕食を食べます。
I eat dinner at home.
Indicates time or a point/period when something occurs (at; when).
午後3時で仕事は終わります。
Work finishes at 3 p.m.
今年で大学を卒業する予定です。
I plan to graduate from university this year.
30歳で会社を辞めた。
He quit the company when he was 30.
Indicates means or method by which something is done (by; with; using).
電車で学校に行きます。
I go to school by train.
鉛筆で名前を書いてください。
Please write your name with a pencil.
インターネットで情報を調べた。
I looked up information on the internet.
A colloquial conjunction meaning 'so' or 'therefore,' indicating cause and result.
雨で試合が中止になった。
The game was canceled because of the rain.
彼は病気で来られなかった。
He couldn't come because he was ill.
道が混んでいて、で、遅刻しました。
The road was congested, so I was late.
A colloquial connective used to change or continue the topic (like 'by the way' or 'so,' as in starting or pivoting a conversation).
で、週末の予定はどうする？
So, what shall we do this weekend?
話は変わるけど、で、今度の会議はいつ？
Changing the subject, by the way, when is the next meeting?
彼は来ないらしい。で、どうする？
It seems he won't come. So, what shall we do?