[Practice Question]

今夜は早く寝て、明日早く起きて勉強（＿＿）。

*こんやははやくねて、あしたはやくおきてべんきょう（＿＿）。

1 することにしよう

2 するところだった

3 するわけだ

4 すればよかった

 

 

 

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[Answer]

今夜は早く寝て、明日早く起きて勉強（1 することにしよう）。

I’ll go to bed early tonight, get up early tomorrow, and study.

(Literal nuance: I will decide to study.)​

 

 

〜ことにする

= to decide to do ~

 

〜ことにしよう is the volitional form of 〜ことにする.

= “Let’s decide to ~” / “I’ll decide to ~”

 

In this sentence:

今夜 (tonight)

→ 早く寝る (sleep early tonight)

あした(tomorrow)

→早く起きる (wake up early)

And then…

→ 勉強する (study)

This is the speaker making their own decision for the future.

 

→ 勉強することにしよう

(I’ll decide to study tomorrow morning.)

 

So, することにしよう is the best choice.

 

 

✖︎ Other Choices:

するところだった

= “I almost did ~”

This is used for something that almost happened.

It does not fit a future plan.

 

するわけだ

= “So that’s why ~” / “No wonder ~”

This shows a reason or conclusion.

It does not mean “to decide.”

 

すればよかった

= “I should have done ~”

This shows regret about the past.

It does not fit tomorrow’s plan.

e.g. もっと勉強すればよかった。

= I should have studied more.

 

 

 

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