〜時(とき)

とき
noun
when, at the time of
time-general
See also: とき (time, when (kana)), 時(とき) (time, when (kanji))
1. when, at the time of
Used after verbs, adjectives, or nouns to create temporal clauses meaning 'when' or 'at the time of.' Functions as a dependent noun that describes the timing of the main clause.
When I went to Japan, I saw Mt. Fuji.
Past tense + 時(とき)
Please come when you have free time.
Na-adjective + な + 時(とき)
When you're in trouble, please contact me.
When you don't understand, please ask the teacher. It's fine to ask as many times as you want.
When I go shopping, I always try to compare prices before buying.

Common patterns

COMMON PATTERNS (tense before the suffix):

The tense of the verb before 時(とき) is set by the order of events, not by past or present: 日本(にほん)へ行(い)く時(とき)、カメラを買(か)った means the camera was bought before or on the way (at home or at the airport), while 日本(にほん)へ行(い)った時(とき)、カメラを買(か)った means it was bought in Japan.

Often followed by particles like は or に: 時(とき)は (when..., as for), 時(とき)に (at the time when).