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I was practicing writing and got corrected by a few native speakers. They all
had a correction in common where they took the ます Verb Stem and then just
added a different verb on the back.

What grammar rule is going on here? What does it mean? When can I use it and
when can't I use it?

My sentences were about cats. The portion I was corrected on was:

> If you don't, they won't stop screaming.

Correction A:

> あなたがそうしないなら彼らは **鳴きやみません** 。
>
> My translation:
>
> If you don't, they won't stop crying (as in making animal noises).

Correction B:

> あなたがもしやめなければ彼らは **叫び続けます** 。
>
> My translation:
>
> If you don't stop, they will continue to scream.

I am not sure if the person that gave me correction b understood what I meant
in the first half of the sentence. But the grammar point I don't understand
was still used (叫び続けます) in the second half.
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question
grammar verbs
ます Verb Stem + another verb grammar meaning?
In verb conjugations, beginning students are typically taught only a single
usage for a verb conjugation. Base-II (or ます form) conjugation, or the い
conjugation, is commonly taught as the form that is used for the ます form of
verbs. While this is true, the ます form is _not_ the only usage that it has.

One of the more common usages for base-II conjugation is for combining or
linking verbs and phrases. Usually this is taught as one of the functions of
the base-て conjugation, as this form of verb linking is most common, but [it
can also be done with base-II
conjugation](https://imulat.com/japanese/blog/how_to_connect_two_verbs_in_japanese).
To link verbs using base-II conjugation simply:

  1. Conjugate the verb to the base-II (or ます) form.
  2. Use the next verb _or phrase_.

Examples:

> 食べ変える (to switch food items (to eat)) --see note  
>  歩き続ける (to continue walking)  
>  友達を呼び、外食に行く (call on a friend and go out to eat)

The difference between using the ます form of the て form conjugation is mostly
in the formality conveyed in the sentence. If you are talking to a superior,
be it at work, school, or politics, you would do well to use the ます form to
link the phrases, [as it is more formal or
literary](https://japanese.stackexchange.com/questions/41133/masu-stem-to-
connect-sentences).

Note:

It should be noted that sometimes, when liking two verbs directly like this,
the result can be someone unpredictable. There is a plethora of verbs that,
though combined in this way, do not have the expected meaning. For example:

行く (to go) + 成る (to become) =
[行き成り](https://jisho.org/search/%E8%A1%8C%E3%81%8D%E6%88%90%E3%82%8A) (abrupt;
without warning)

* * *

This was not asked in the question, but I think that it should be addressed.

With regard to correction A:

> あなたが **そうしないなら** 彼らは鳴きやみません。

While grammatically correct, I think that there is a nuance that needs to be
addressed. [Using
なら](http://www.guidetojapanese.org/learn/grammar/conditionals) as an 'if'
typically carries the feeling of, "If it is true that ____, then ____." What
comes before なら in this case is usually assumed or hypothetical.

What you are talking about here isn't hypothetical, it's more certain. In this
case I would use と as your 'if.' It carries a more certain "If ____, then
____" relationship.

> あなたが **そうしないと** 彼らは鳴きやみません。
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answer