〜ていく
Continue / change from now 〜ていく
Meaning
An action or state that continues, changes, or develops FROM NOW ON into the future — "will go on ~ing / will continue to ~". Also: do something and then go (away).
Formation
[verb te-form] + いく
Notes
Directional: 〜てくる looks BACKWARD (up to now); 〜ていく looks FORWARD (from now). Used for gradual changes: 暑くなっていく ("it will keep getting hotter"). Also physical: 買っていく ("buy and go").
Examples
これからも日本語(にほんご)を勉強(べんきょう)していくつもりです。
I intend to keep studying Japanese from now on.
Breakdown
これからもっと寒(さむ)くなっていくでしょう。
It will probably keep getting colder from now on.
Breakdown
ペンを持(も)っていってください。
Please take a pen (with you). (physical 〜ていく)
Breakdown
ずっと一緒(いっしょ)に暮(く)らしていきたいです。
I want to go on living together forever.
Breakdown
彼(かれ)は走(はし)っていきました。
He ran away.
Breakdown
⚠️ Often confused with
〜てくる
Has become / do and come back 〜てくる
Three uses: (1) a change that has occurred UP TO NOW — "has come to ~"; (2) do something a...