This shows what you use to do something. It points out the tool or method.
Noun + でPrimary
This shows what you use to do something. It points out the tool or method.
毎日、電車で会社に行きます。
I go to work by train every day.
英語で話さないで、日本語で話してください。
Please don't speak in English; please speak in Japanese.
この机は木で作られているので、とても重いです。
This desk is made of wood, so it is very heavy.
この問題はパソコンで解決できるよ。
You can solve this problem with a computer.
Imagine 'で' is like a magic key. It unlocks how you do things. You can use it for tools, like a pen. You can use it for ways to travel, like a bus. You can even use it for languages, like Japanese.
This 'de' is for tools. It is different from 'o' which marks what you act on. It is also different from 'to' which marks a person you do something with. This 'de' tells you how you do something.
Watch out: People often mix up "de" and "ni" for travel. Use "de" to say how you travel. For example, "densha de iku" means "go by train." Use "ni" when you say "get on" something. For example, "densha ni noru" means "get on the train." "De" shows the way you travel. "Ni" shows the action of getting on.
Don't use this when you walk somewhere. Use "歩いて" (aruite) instead. For example, say "駅まで歩いて行きます" (I walk to the station).
Often confused with(1)
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