Understanding what are they requires examining multiple perspectives and considerations. word choice - Is it: 'They and I?' Or: 'Them and I?' Or: 'Them and me .... It depends on where you want to use the phrase. If it is a subject, you should say they and I. The example you gave should be the only difference between them and me is this, because them and me is the object of the preposition between.
It's important to note that, - English Language Learners Stack Exchange. Building on this, i assume that, as @Mari-LouA said, that they would be italicized or enclosed in air-quotes. So, considering this, the question is grammatically correct. This means that they is considered as an object and then it takes the 3rd singular form of the verb to be in the question.
Why did this B say who is they instead of who are they? This is common to be found in literature, in order ... They are a or It is a - English Language Learners Stack Exchange. The question is: What days are the first and the second of July? Similarly, what is correct: - It is a Monday and a Tuesday.
or - They are a Monday and a Tuesday. 4 "Are they?" is the standard question form. This perspective suggests that, in a question, we normally begin the sentence with an interrogative word like "where" or "how", or "is" or "are" or "do" or "does". This perspective suggests that, "They are?" is an example of a declarative statement turned into a question by simply putting a question mark at the end.
How are they/How were they? There's a grey area between the present and the past. If someone asks you are how your parents are, and they were fine last time you saw them, you are likely to answer They're fine unless you have reason to believe otherwise. It doesn't really matter whether you saw them yesterday or last week. In relation to this, and the same applies to your question.
word usage - Which one is correct for my topic - "where they are from .... You should use "where they are from," as this is perfectly normal in speech. It's important to note that, but technically, it is incorrect to end a sentence with a preposition like "from." A strictly correct usage would be something like, "it doesn't mater from which country they come," although so few people use this rule that it seems out of place in everyday language. Additionally, using "they" in tag questions with everybody/nobody etc.
2 When you want to add a tag question to "There is nobody in the garden." would it be "are they"? Equally important, i just have read before that in tag questions we use (they) when the question include everybody/nobody etc. Why do people use they/them pronoun for a single person?. 0 "Singular they" does have a long history in English, and cannot be considered wrong.


📝 Summary
Understanding what are they is crucial for those who want to this area. The knowledge provided here functions as a valuable resource for continued learning.
