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Does the -ou / -you / -mashou (the "let's X") form have a negative
counterpart? For example, how do I say "let's not X" for the following?:

  * 行こう
  * 食べよう
  * 寝ましょう

As far as I can remember, the Japanese courses I took in college did not teach
me the negative of this form. Does it even exist? If it does not exist, how do
you say "let's not X" in Japanese?
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verbs conjugations negation imperatives
Does -ou / -you / -mashou conjugation have a negative form?
The -ou/-you form does have a negative counterpart, but it's considered rather
literary, and in any case never used in a cohortative meaning ("Let's X").
That form is the なかろう form, e.g.: 食べなかろう, which means "[He/I/etc.] probably
wouldn't eat." and is equivalent to the more colloquial form "食べないだろう".

I think the most common simple way to express the meaning of "Let's not X" in
Japanese is:

  * 行かないね。
  * 食べませんね。

Another option is to use a compound expression such as Xするのはやめる (which
literally means "stop doing X") or Xないことにする (which literally means "Choose not
to do X"). For instance:

  * 行くのはやめよう。
  * 行かないことにしよう。
  * 食べるのはやめましょう。
  * 食べないことにしましょう。

There are a quite few more possible combination such as Xないようにしよう, Xないでおこう,
Xことはやめておこう, etc. Each has a slightly different nuance, so there's no direct
equivalent of the positive form, but rather many different ways to express the
negated idea.
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According to my understanding, they don't have one for 非意向形.

Instead, I would use

  * 行かないことにしよう

or If someone ask me, and if I don't want to, I will say.

  * （今回は）やめておきます

for 食べよう

  * 遠慮します

for 寝ましょう

  * 無理です... :P
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2011-06-03T10:28:33.453
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Though these are not used so much:

  * 行かないでおきましょう/行かないでおこう
  * 食べないでおきましょう/食べないでおこう
  * 寝ないでおきましょう/寝ないでおこう/起きてましょう/起きてよう
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2011-06-03T10:32:48.070
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According to [Tae
Kim](http://www.guidetojapanese.org/learn/grammar/volitional2), there _is_ a
negative volitional form, but it is archaic and formal, so you're better off
using the modern expressions given by the other answers.

However, it does show up every now and then (トキ in 北斗の拳 seems to like using
it), and it's a pretty simple conjugation, so it's worth knowing.

To form the negative volitional, you add まい to the end of the verb. If it's a
る verb you drop the る first, so 食べる -> 食べまい. If it's an う verb, just add it to
the end, so 探す -> 探すまい. する and くる become するまい and くるまい (isn't it rare that
they fit the pattern governing the other verbs?), and you add まい after the ます
form for politeness, 死にます -> 死にますまい.

examples from 北斗の拳:

> こんな馬にまたがる男はひとりしかおるまい
>
> おまえたちと同じ地上に降りたたねばなるまい！！
>
> その棍棒が血ぬられることはあるまい！
>
> しかたあるまい
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`**Long story short:**`

**Let's not go** is simply **行くのは止めましょう**

If we use **行かないことにしましょう** it is more like **Let's decide to not go**

I think **行くのは止めましょう** is a _stronger_ **Let's not go** compared to
**行かないことにしましょう** , though I'm not sure (someone may wish to verify / de-verify
it)

`**Long story:**`

As the -おう/こう/.../よう and -ましょう forms have no negative, the まい ending is
sometimes used in the situation of expressing negative intention. It cannot be
used to express a "let's not" situation, and in any case is a literary form
and rarely seen at the ends of sentences, however it is fairly common in a
dependent clause to show one's strong determination not to do something, as in

私は、彼女とは二度と会うまいと思う。 (I'm certainly not going to see her ever again!)

Often "Let's not do ..." is expressed by saying "Let's stop doing .." using
止める or 止す. E.g.

パーティーに行くのは止めましょう。 (Let's not go to the party.)

Another construction which means "let's decide to" or "let's try to" is
verb+ことにしよう/しましょう or verb+ようにしよう/しましょう. For example:

名古屋までバスで行くことにしましょう。 (Let's [decide to] go as far as Nagoya by bus.)

This construction can be used where appropriate in negative sentences.

バスでは行かないことにしましょう。 (Let's [decide to] not go by bus.)

Note that that are many verbs where the volitional/hortative forms cannot be
used in a meaningful way. One cannot say "午後に雨が降りましょう", for example. On the
other hand, one might hear rockers on the stage yelling:

のってるか？今夜は燃えようぜ！ (You guys getting in the mood? Let's burn it up tonight!)

`**Side Track:**`

The まい auxiliary can also be used to carry the sense of "probably not". As
with the use of まい in the volitional category, this usage is strictly
literary.

彼はもう英語を教えるまい。 (Most probably, he won't teach English any more.)

The -ないだろう form has the literary alternative form: なかろう.

`**Source:**`

<http://www.csse.monash.edu.au/~jwb/wwwverbinf.html> (there's alot of goodies
packed in that small page ;)
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Just wanted to add that I also read that there is another conjugation that's
not within these answers yet.

However, it is archaic so you shouldn't use this in normal conversations.

It is still useful to know in case you stumble to read something like this:

行くのはよそう - let's not go

よそう from the word 止す (to cease)
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