Questions & Answers about Bin tane kalem var.
Why isn't it "kalemler" since there are a thousand of them?
In Turkish, whenever you use a number (like bin) or a quantity word before a noun, the noun must stay in its singular form. So, it is always bin kalem (a thousand pen), never bin kalemler.
What does the word "tane" do here? Is it required?
Tane translates roughly to "item" or "piece". While it isn't strictly required—you could just say Bin kalem var—it is extremely common in natural Turkish to place tane between a number and the object you are counting.
The translation says "a thousand", but there is no word for "a" or "one" (bir). Why?
In Turkish, you do not use the word bir (one) before hundred (yüz) or thousand (bin). While English speakers say "one thousand" or "a thousand", Turkish speakers simply say bin.
Why is "var" at the very end of the sentence?
Even though var translates to "there is" or "there are" rather than a typical action verb, it acts as the main predicate of the sentence. In Turkish, the predicate almost always goes at the very end.