In English, it is grammatically incorrect to tack a question word (who, what, why, when, where, how) at the beginning of a sentence and leave the rest of the sentence unaffected. (At this time I cannot think of an exception to this.)
In an interrogative sentence (a sentence which asks a question), the subject and the verb are inverted so that the verb comes first. See first example below. The only verb in that sentence is is. In the second example below (a declarative sentence), notice that are is a helping-verb to the verb asking, and they are next to each other. In the interrogative sentence, they are separated because the helping verb are and the subject you invert.
- What is your name? (Interrogative)
- Your name is Fred. (Declarative)
- Why are you asking? (Interrogative)
- You are asking because you want to know. (Declarative)
While мужчина ends in а and therefore looks like a grammatically feminine word, it is actually a masculine word simply because it always and specifically refers to a male person, similar to папа. There are often a handful of exceptions like this in languages that use the gender system, where, if the gender of the person the word is referring to is obvious, then it trumps the grammatical gender.
I'm assuming that you are not very familiar with English and are asking what the n't here means, sorry if your question was meant to ask something different.
n't is a very common way to shorten "not" in English. Isn't = is not, didn't = did not, wouldn't = would not, etc. This is called a contraction, it is a way to take a few letters out to shorten common phrases, and we use them a LOT in English. A few other common ones to remember are 's for is (it's = it is), 're for are (you're = you are), 'd for would (he'd = he would), and 've for have (would've = would have).
Actually, I think it's in reference to the mobile app for (at least) iOS. In the app, there is an exercise with a Russian sentence to translate, and tiles of English words to rearrange into the correct translation. I got this exact sentence while studying last night. For this sentence, one of the tiles is n't. I've had this happen before, where the contraction is treated as a separate tile. Overall, this is pretty rare; usually the tile says not instead. So you put together tiles of
Why || is || n't || this || man || sleeping
Not surprised if that is confusing for non-native English speakers; looks just plain funky to me. But I reckon that's what the OP referred to.
Why does this man not sleep?
Why is this man not sleeping?
Why isn’t this man sleeping?
These are three grammatically acceptable phrasings of the question.
When you use a “to be” conjugation (am, is, are, was, were) with another verb, the second verb is in a gerund form (this means it ends with “-ing”). I am sleeping, he is sleeping, they are sleeping, I/he was sleeping, they were sleeping.
Please also note the inversion of the first verb and the noun in this interrogative sentence. “Why is this man not sleeping?” If this were a statement rather than a question, it would be, “This man is not sleeping because (...).”