When to use "is" vs. "does" when asking a question?
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?" vs "How does it work?" - English Language …
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.
sequences and series - Does $\sum\frac {\sin n} {n}$ converge ...
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.
Does $\pi$ contain all possible number combinations?
Oct 19, 2012 · $\pi$ Pi Pi is an infinite, nonrepeating $ ($ sic $)$ decimal - meaning that every possible number combination exists somewhere in pi. Converted into ASCII text, somewhere …
What does "Re:" in a business letter mean? - English Language …
Nov 17, 2013 · Wiktionary lists re as a preposition that means “About, regarding, with reference to; especially in letters and documents”, while OED1 (1914) says: Re sb² [Ablative of L. res …
Which of these is correct, “She doesn't has” or “She doesn't have”?
She doesn't has a book. She doesn't have a book. Why is the first sentence wrong? We use 'has' with singular, and 'she' is singular.
“What does this mean?” vs. “What is this meaning?”
This is correct for the context you described. There are other things you could say, of course, but "What does this mean?" is perfectly fine for the situation. 🚩 "What is this meaning?" On the …
Should I say "what does it means" or "what does it mean"?
Oct 16, 2015 · What does it mean? In your answer, DO-support is not required; MEAN is the only verb and takes the finite form which bears the desired tense (present) and agrees with the …
What does $\\mathbb{R}^n \\to \\mathbb{R}^m$ mean? And …
What the does Rn mean? For example if something says that it is a transformation T: R2 → R3. Does that mean that R2 = 2 × 2 matrix? and that R3 = 3 × 3 matrix?
Does negative zero exist? - Mathematics Stack Exchange
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"?