When do I use is or does when I ask a question? For example, Is your item still for sale? Does your item still for sale? I am not sure which one to use.

How it works is a phrasal noun. How does it work? is an interrogative sentence (question). The former is commonly used as a heading and there is no question mark at the end.

In context, Leonardo Dicaprio simply means he counts Kate Winslet among his BFF (Best Friends Forever, bosom buddies. It's a trivial metaphoric extension from the somewhat more literal …

Jun 20, 2015 · Well, neither one is a complete sentence, but you probably realize that. Let's go ahead and make them complete sentences anyway: I am not sure does it work. I am not sure if …

Does $\sum\frac {\sin n} {n}$ converge? I have tried the comparison test, root test and ratio test but still can't prove it is convergent or divergent.

Nov 17, 2013 · What does "Re:" in a business letter mean? Ask Question Asked 12 years, 1 month ago Modified 7 years, 2 months ago

Feb 8, 2014 · In the set of real numbers, there is no negative zero. However, can you please verify if and why this is so? Is zero inherently "neutral"?

Sep 15, 2022 · It makes no sense to me. Dick sounds absolutely nothing like Richard. Other English nicknames confuse me as well. Bob for Robert, Bill for William, Jim for James, though …

You say you don't understand what $\mathbb {R}^n$ means. Do you have difficulty with the real plane (ie $\mathbb {R}^2$) or real 3D space (ie $\mathbb {R}^3$) ?

Jan 28, 2015 · UPDATE February 01, 2018, the OED has recently added the word swag in its dictionary. Oxford Online Dictionaries reports A new entry has been added for swag, derived …