続ける details
write + keep doing
kaki tsuzukeru
keep doing; continue to do
meaning: keep writing
もう三時間も歩き続けてるんだけど、まだ着かないの?
mou sanjikan mo arukitsuzuketeru n da kedo, mada tsukanai no?
We've been walking nonstop for three hours already — are we still not there? casual
雨は一晩中降りつづける。
ame wa hitobanjuu furi tsuzukeru.
The rain keeps falling all night. neutral
- past
- polite
Examples
keep doing — the activity carries on without stopping
もう三時間も歩き続けてるんだけど、まだ着かないの?
mou sanjikan mo arukitsuzuketeru n da kedo, mada tsukanai no?
We've been walking nonstop for three hours already — are we still not there? casual
雨は一晩中降り続けた。
ame wa hitobanjuu furitsuzuketa.
The rain kept falling all night. neutral
祖父は八十歳になった今も畑で働き続けている。
sofu wa hachijuusai ni natta ima mo hatake de hatarakitsuzukete iru.
Even now at eighty, my grandfather keeps working in the fields. neutral
当社は今後も品質の向上に取り組み続けてまいります。
tousha wa kongo mo hinshitsu no koujou ni torikumitsuzukete mairimasu.
We will continue to work on improving quality going forward. formal
Formation
{V-masu-stem}つづけるattaches to ます-stem
Notes
Related patterns
Similar
Complementary phases of one aspect paradigm — 始めた places you just inside the event, 続けた presupposes an earlier stretch of it; 三年勉強し続けた entails a し始めた three years back, never the reverse.
Both stretch an event through time — 変わり続ける presents one unbroken or steadily repeated course, while 変わっていく tracks a drift that tolerates gaps and adds a direction away from now that 続ける lacks.
Lookalikes
The two stack in 走り続けている, which betrays the split — 続ける keeps the activity itself going and takes tense like any verb, while ている only views an event from inside; plain states take ている freely (住んでいる), and 続ける often adds a flavor of persisting (住み続ける can imply reasons to leave).
Identical compound shape one tail apart — 書き終わる closes the activity, 書き続ける refuses the close; a skimming reader parses the shared masu-stem and coasts, so the tail verb carries the entire meaning.