(とき)

とき
noun
when, at the time of
See also: とき (time, when (kana)), (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 + (とき)
Please come when you have free time.
Na-adjective + な + (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.

GRAMMAR PATTERNS:

TENSE NUANCE:

This tense distinction is important: dictionary form emphasizes the time before or during the action, while た form emphasizes after the action is complete.

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