Yesterday, we learned the sentence construction in which the adverbial clause ending with “-toki,” modifies the main clause. And verbs in the adverbial clause are in Dictionary form or Nai-form so that they can be placed in front of a noun “toki”. Examples are as follows;
1. Eigo no Hon o Yomu toki, Denshi-Jisho o Tsukaimasu. (When I read an English book, I use an electronic dictionary. — Dictionary form + toki
2. Denwa ni Derarenai toki, Me’eru o Kudasai. (If you can’t answer my phone call, send me an email.) — Nai-form + toki
There adverbial clauses ending with “toki,” in 1 and 2 are a kind of conditional clauses. You see “if” in English translation of the sentence 2. Conditions are;
<1> Condition is that the action “Yomu (read)” takes place.
<2> Condition is that the situation “Derarenai (can’t answer the phone)” exists.
It is like these conditions are “when you do” and “when you don’t (can’t) do”. But think about verbs. For most of verbs, things change from before the action taking place to after the action had been done. In Japanese, an action which is not yet taken place becomes Dictionary form. An action which has already been done becomes Ta-form. So for today, let us learn the difference between the following two;
[V-dic] + toki, [Main Clause].
[V-ta] + toki, [Main Clause].
(1) Main Clause of Present tense
– Maiasa Kaisha ni Iku toki, Densha ni Norimasu. (When I go to my company every morning, I get on a train.) — Dictionary form + toki,
– Maiasa Kaisha ni Itta toki, Minna ni Aisatsu o Shimasu. (When I get to my company every morning, I say hello to my co-workers.) — Ta-form + toki,
(2) Main Clause of Past tense
– Narita Kuukou e Iku toki, Kaban o Kaimashita. (While I was on the way to Narita Airport, I bought a bag.) — Dictionary form + toki,
– Narita Kuukou e Itta toki, Kaban o Kaimashita. (When I got to Narita Airport, I bought a bag there.) — Ta-form + toki,
In the above examples, you can see that tenses do not agree between subordinate clause and the main clause. Paying attention to tense agreement is good, but it is more important to decide the tense of each verb based on if it’s action of “already done” or “about to be done”.
This post was written with reference to the exercise A2 on Section23 of “Minna no Nihongo (2nd Edition)” published by “3A Corporation”