to express when at the last time i done something, in Japaneses language we can use toki, (時）,see the example below:
私はテレビを見るとき コーヒを飲みます。
watashiwa terebi wo miru toki kohi wo nomimasu.
When looking TV, I drink a coffee.
さびしいときも嬉しいときも彼女は良くこの音楽を聞きます。
sabishii tokimo ureshii toki mo kanojo wa yoku kono ongaku wo kikimasu.
when sad or happy she always listen this music.
私は結婚したとき、祖母は泣きました。
watashiwa kekkon sita toki, sobo wa nakimashita.
When I was married, the grandmother cried.
Grammar
from three sentence sample we can consider that :
1. Verb before toki （とき）and after toki has not relationship.
2. The verb before toki and after toki, happen at same time.
3. toki can use both past and future sentence.
before toki become V.ru (now and future form) or V.ta (past form) is unrelated yo the tense of the main clause. in case where the action before toki is already complete and there is second action,you should use V.ta (past form)
in cases that the action is not complete or simultaneous action (now and future) you should use V.ru
example sentence number 1 and 3 are using v.ru, sample sentence number 2 using V.ta
Ganbatte
ガンバッテ ！！
私はテレビを見るとき コーヒを飲みます。
watashiwa terebi wo miru toki kohi wo nomimasu.
When looking TV, I drink a coffee.
さびしいときも嬉しいときも彼女は良くこの音楽を聞きます。
sabishii tokimo ureshii toki mo kanojo wa yoku kono ongaku wo kikimasu.
when sad or happy she always listen this music.
私は結婚したとき、祖母は泣きました。
watashiwa kekkon sita toki, sobo wa nakimashita.
When I was married, the grandmother cried.
Grammar
from three sentence sample we can consider that :
1. Verb before toki （とき）and after toki has not relationship.
2. The verb before toki and after toki, happen at same time.
3. toki can use both past and future sentence.
before toki become V.ru (now and future form) or V.ta (past form) is unrelated yo the tense of the main clause. in case where the action before toki is already complete and there is second action,you should use V.ta (past form)
in cases that the action is not complete or simultaneous action (now and future) you should use V.ru
example sentence number 1 and 3 are using v.ru, sample sentence number 2 using V.ta
Ganbatte
ガンバッテ ！！