TAKOBOTO

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〜時
toki
JLPT N3
Edit  dc
〜とき
Meaning
when
when i was in japan
Edit  dc
Formation
Verb (casual)
+
+
(に)
+
(は)
い-adjective
+
+
(に)
+
(は)
な-adjective
+
+
+
(に)
+
(は)
Noun
+
+
+
(に)
+
(は)
Edit 
See also
Phrases
わたしはにほんにいったときにほんごをべんきょうした
when i was in japan, i studied japanese
Edit  #531 dc, spurrymoses
いつでもつごうのいいときにおかねをかえしてください。
Pay me back when it's convenient.
Edit  #3141 dc
なにというときにでてきたんだ!
How on earth could you make your appearance at a crucial time like this!
Edit  #3142 bamboo4, dc
Discussion and comments
This kanji can also be read as [ji] in compounds.
andyc
ex#531 I feel the Japanese is not natural. It would be 私は日本にいた時日本語を勉強した。or the second user comment 私は日本に行った時に日本語を勉強した。
Miki
I see noting wrong with 行った時.Adding に would provide emphasis, such as "I studied Japanese when I went to Japan" (with an implication that happened at no othe time.)
bamboo4
I believe that example one is incorrect. I believe it should be:
私は、日本に行った時に(は)、日本語を勉強した。
You can add or leave out the は depending on how you wish to say it.
your name
Is this usually toki+ni?
dc
You can dispense with either に or は or には, which I think is nore conventional.
bamboo4
tabi i think is often used for repeating things. more like "each time i go to japan" than "when i went to japan".
dc
is there some rules to observed as to use ta-form or impolite form for the preceding clause before the toki under certain conditions? Arigatoo.
natsumi
#531
私は、日本にいた時、日本語を勉強した。Good job, Miki.
Nick
it helps me to think of に as crosshairs. It zeros in on a specific time. "At" covers this function nicely in English. It's not correct to use it if there is no specific time. 一時に "at 1 o'clock" and 明日 "tommorow" as we don't say "at tommorow". This metaphor can be used for indirect object に as well.
sw
But we say 明日(あした)には, meaning by tommorow."
bamboo4
To me it sounds like without に, the sentence might be more like "When in Japan, I studied Japanese." and adding に would be somewhat like "When I was in Japan, I studied Japanese." The first one would put more emphasis on studying Japanese (but happen to state where) and the second would be saying what one did in Japan (which was studying).

I think I pretty much just reworded what everyone else was saying, in a way, right?
Saralynne