Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

[Q]: Question: I'm wondering which one of these expressions is correct? This stuff or these stuff? 
Answer: In your expressions, stuff is a noun and is uncountable. I would say it is "this stuff". The only time I can think of stuff being plural is when it is a verbas in he stuffs the turkey with .
[A]: no


[Q]: Question: Which is correct? The thief carried the knife carefully so as not to cut himself. The thief carried the knife carefully not to cut himself. 
Answer: I am not an English major but these answers seem wrong to me. I came here to see if "so as not to" was considered appropriate in any case. The comma makes it sound like the writer is trying to say that the killer was not suicidal and wasn't carrying the knife to intentionally cut himself. This is not what the author means. He means to say that the thief was carrying the knife in a protective manner so that it would not accidentally cut him. I would use, "The thief carried the knife carefully so that he would not cut himself.".
[A]: no


[Q]: Question: English isn't my mother tongue, and when we recently talked to a native speaker (during some company audit), he pointed out that the plural word "trainings" is actually wrong (he pointed that it is a very common mistake and was almost amused by it). I couldn't understand why and wondered what the correct plural of "training" would be. Online Dictionaries/Thesaurus don't answer it, so it's probably another opinion-based statement. I haven't found a source to back it up, though. 
Answer: I agree with Mick that training is an uncountable noun. In the example given by Mr. Fine of a specific training event allowing training to become countable, I disagree. In the case of becoming countable, the portion being counted is the event. Therefor, it would be "there are multiple training events available at the pavilion" (or whatever). I see many cases where much effort is made to "fix" the plural when a simple rewording will eliminate the contentious context and allow an, arguably, better flow by using the standard form.
[A]:
no