In answers the question where?, into answers where to?, describing movement inside something. She is in the office means she's there; She walked into the office means she went inside. If you can ask where to?, you probably need into.
in or into — can you pick the right one?
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be/stay/live + in + place; go/walk/get + into + place; translate/turn + into + noun; put + noun + in/into
- My keys must be in the car, I had them a minute ago.
- We walked into the museum just as it started to rain.
- She translated the letter into Korean for her grandmother.
What changed
First versionCould you translate this email in English for our new client?
RevisionCould you translate this email into English for our new client?
You say in English, so a request to translate seems to need in too. But translation moves a text from one language into another, and that movement is into: translate into English. In English describes the language something is already written in: The email is in English.
Into describes not only movement but also change: The caterpillar turned into a butterfly; Cut the cake into eight pieces. With put, both work: Put the milk in the fridge or into the fridge, and in conversation in is even more common.
Your turn
Don't worry, your passport is ___ the front pocket of your backpack.
Show the answer
in — There's no movement here: the passport is already in the pocket, so the question is where? That means in. Into would be needed with a verb of movement: I put my passport into the front pocket.
Describe a morning on a trip: a place you walked into and where you then spent your time. Use both into and in.
On my first morning in Rome, I walked into a tiny café and spent an hour in a corner seat by the window.
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