あしたから まいにち 10キロ （ ） と おもう。
Last week, I talked about the plain volitional form, meaning “let’s…” Today’s topic is a variation of that.
The direct translation of あしたから まいにち 10キロ （ ） と おもう would be: “I think that I (…run…) 10 km every day from tomorrow. In English the most likely words for the brackets would be “will run” but this “will” is not just indicating a future action but it is to show a commitment or the intention of doing so. Thus, in Japanese the correct answer is d. はしろう.
Running 10 km every day needs a certain amount of commitment, so here you cannot use just はしる, Instead, you need a verb in the volitional form to show the “will.”
It is OK to use はしる if you are talking about somebody else, i.e. たろうさんは あしたから まいにち 10キロ はしると おもう (= I think Taro will run 10 km every day from tomorrow on.) as you don’t need a commitment for Taro’s running.
[plain volitional form] と おもう is almost the same as [dictionary form] つもりだ = intend to do ～.
あしたのパーティーにいこうとおもう。
≒あしたのパーティーにいくつもりだ。
七月のJLPTしけんをうけようおもう。
≒七月のJLPTしけんをうけるつもりだ。
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