Grammar Point
noun (common) (futsuumeishi)
n 
adverb (fukushi)
adv 
時とき

occasion, case

Verb or い-Adjective + とき

When using a verb or an い-adjective with とき, the modifier is placed directly before it in its informal form. This indicates the specific time or situation when an action occurs or a state exists.

Verb

Verbs in their dictionary or past informal forms can modify とき.

When I go to the library, I borrow books.

When I ate the cake, it was delicious.

い-Adjective

い-adjectives in their dictionary or past informal forms can modify とき.

When the coffee is hot, please be careful.

When I was young, I played outside.

Note

The tense of the verb before とき depends on whether the action is completed at the time of the main clause. Use the dictionary form for actions that have not happened yet, and the past tense for actions that have already occurred.

な-Adjective or Noun + とき

When using a な-adjective or a noun with とき, specific particles are required to connect them to the noun とき.

な-Adjective

な-adjectives require な in the present tense and だった in the past tense before とき.

When it is quiet, I study.

When I was free, I watched a movie.

Noun

Nouns require the particle の to connect to とき. In the past tense, だった can also be used.

When I was a child, I liked candy.

In case of an emergency, use the stairs.

Words: 
時とき
Radicals of radicals