とき
(Toki)
when / at the time of.
Connection rules
- +V plain (non-past or past) + とき(に); i-adj + とき(に); na-adj + な + とき(に); noun + の + とき(に).
- +Non-past V + とき: action happens at the time of / as X begins.
- +Past V + とき: action happens after X has occurred / during an ongoing X.
Examples
1.
子供のとき、よく公園で遊びました。

Kodomo no toki, yoku kouen de asobi mashi ta.
When I was a child, I often played in the park.
「when / at the time of」
2.
日本へ行ったとき、友達に会いました。

Nippon e i ta toki, tomodachi ni ai mashi ta.
When I went to Japan, I met a friend.
「when / at the time of」
Practice
I usually watch YouTube when I am free.
___、よくYouTubeを見ます。
Romaji also accepted