The Particle で as an Instrument Marker
で as an instrument marker
When で is used as an instrument marker, it indicates by what means an action occurs.
Nihongo de tegami wo kakimashita.
“I wrote the letter in Japanese.”
Kuruma de Akihabara ni ikimashita.
“I went to Akihabara by car.”
Hashi de osushi wo tabemashita.
“I ate sushi with chopsticks.”
*A special case in which the で is dropped is in the presence of the verb 歩いて, or “to walk”. As opposed to “Aruite de konbini e ikimasu”, “Aruite conbini e ikimasu” is the correct grammar.