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> あさっては大雨【おおあめ】が降【ふ】るそうだよ。ハイキングは来週【らいしゅう】（ ）。(source: pg. 55, 新完全マスター)

The choices available are:

> **a.** 行【い】こうとしようよ
>
> **b.** 行【い】くことにしようよ
>
> **c.** 行【い】くようになろうよ

According to the textbook, the correct answer is **b** , though I am confused
as to why **a** is invalid.

As far as I understand, **a** would translate to something like "let's try to
go next week", where as **b** would translate to "let's decide to go next
week".

Both choices seem to make sense, and I am seeking an explanation as to why
**b** is preferable over **a** , and furthermore, perhaps a more general rule
for determining which construct to use.

**c** , on the other hand, does not make much sense to me, though if there is
something I should be aware of (perhaps it makes more sense than I think it
does?), I would also like to know.
CC BY-SA 4.0
2015-05-08T07:54:21.447
24190
2022-01-01T22:37:31.413
2022-01-01T22:37:31.413
30454
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question
grammar word-choice usage
Acceptability of 〜ようとしよう vs. 〜ことにしよう
Even without any context to go with, only [b. 行くことにしようよ] is correct as a
phrase. We would never say [a. 行こうとしようよ] or [c. 行くようになろうよ] in any situation.

The problem with [a. 行こうとしようよ] is that it is double-volitional (行こう & しよう) and
it is ungrammatical. It is grammatical to say 「行くと **しよう** 」 or 「 **行こう** とする」
in single-volitional, but not 「行こうとしよう」 in double. Though it is ungrammatical,
it sounds a little "better" than [c. 行くようになろうよ].

> As far as I understand, a. would translate to something like "let's try to
> go next week"

Your translation is single-volitional, not double. 「行こうとしようよ」 means something
like "Let's **try** to **try** going next week.", which is why it is an
incorrect answer.

[c. 行くようになろうよ] sounds pretty -- for lack of a better word -- "hilarious"; it
is ungrammatical and it makes close to no sense. The 「なろうよ」 part is just out
of place. One could say 「ともだちになろうよ！」= "Let's become friends!", but not
「行くことになろうよ」.
CC BY-SA 4.0
2015-05-08T08:52:33.553
24192
2022-01-01T22:11:41.947
2022-01-01T22:11:41.947
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24190
answer