Explanation
Expresses the time when something happens, 'when', 'at the time'.
Formation
Verb-casual + とき / い-Adjective + とき / な-Adjective + なとき / Noun + のとき
Detailed explanation
The ～とき grammar point is used to express the time when something happens or happened. It can be translated as 'when' or 'at the time' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.
Examples
Kouen de asobu toki, boushi wo kaburimashou.
When playing in the park, let's wear a hat.
Kono ringo ga akai toki, tabegoro desu.
This apple is ready to eat when it is red.
Watashi ga benkyou suru toki, kazoku wa shizuka ni shite kuremasu.
When I am studying, my family keeps quiet for me.
Kodomo no toki, yoku obaachan no ie ni asobi ni ikimashita.
When I was a child, I often went to play at my grandmother's house.
Practice
Grammar content sourced from hanabira.org.