You would never use a comma between the d and s in the word periods because it is the plural form of the word period. Now if you were showing a possession of someone then you would use the comma. Here are some examples:
Considering these four sentences: A: Mount Everest is in the Himalayas, on the border, between China and Nepal. B: Has he ever driven to Myrtle Beach South Carolina? C: This year Labor Day is on Monday September 2. D: On October 1, 1890, Yosemite National Park was established. The answer is D. In A, there is an extra comma after the word border, and some would say after Himalayas as well. In B, there is a comma missing between the city (Myrtle Beach) and the state (South Carolina). In C, there is a comma missing between the day (Monday) and the month (September). That leaves D as correct.
this is a very good question you should search it up =D
I use MD, without periods after the M and D.
Normally, yes but not necessarily. :D The Cat
It depends on the style guide you are following. In American English, the comma before "and" in a list is known as the Oxford comma, and it's optional. In British English, the Oxford comma is typically not used. It's essential to be consistent in your use of the Oxford comma throughout your writing.
An era, in geologic terms, is a geological time period encompassing two or more geologic periods.
there is a comma after the c, so its C, D P D 7 that doesn't answer what it means does it? ---- Cabra, Dublin Postal District 7. ?
it goes after. like ... so, what did you do at the weekend? There you gooo :D
Excel does not use format symbols.
Sometimes periods can be irregular. Don't worry about it because it is totally normal. :D Hope this helps!
The sentences would be punctuated as: A. if you ask me, he is a tennis whiz. (use comma) B. She bought a new tennis racket and showed it to me. (no comma needed) C. He loves tennis; he plays every day. *(semi-colon between the two related thoughts) D. When she is worried, she over eats. (use comma)
"Remember that June 6, 1944 was D-Day." (some styles recommend a second comma, after 1944)