How to check your apostrophes are correct - BBC Bitesize
...Apostrophes can often be tricky to use. Find out how to become an apostrophe expert with this Bitesize KS3 English guide....
https://www.bbc.co.uk/bitesize/articles/zd7w7p3
Apostrophe - Wikipedia
...The apostrophe (?, ') is a punctuation mark, and sometimes a diacritical mark, in languages that use the Latin alphabet and some other alphabets. In English, the apostrophe is used for two basic purposes: It is also used in a few exceptional cases for the marking of plurals, e.g., "p's and q's" or Oakland A's....
https://en.wikipedia.org/wiki/Apostrophe
The Apostrophe - University of Sussex
...The apostrophe (') is the most troublesome punctuation mark in English, and perhaps also the least useful. No other punctuation mark causes so much bewilderment, or is so often misused....
https://www.sussex.ac.uk/informatics/punctuation/apostrophe
Using apostrophes - BBC Bitesize
...Brothers is a plural noun that ends in an 's', so you don't add another 's' after your apostrophe. You can just add an apostrophe to show the feet belong to the brothers....
https://www.bbc.co.uk/bitesize/articles/zdsthbk
Apostrophe - Simple English Wikipedia, the free encyclopedia
...The apostrophe (?, ?, ?), also known as the apostrophus, is a punctuation mark used in writing. It is also a diacritic. In English, it has two jobs: [1] To show where one or more letters have been left out, as in the abbreviation (contraction) of do not to don't. To show the possessive case, as in the cat?s whiskers....
https://simple.wikipedia.org/wiki/Apostrophe
The Apostrophe - Touro University
...To form the plural of a lowercase letter, place 's after the letter. There is no need for apostrophes indicating a plural on capitalized letters, numbers, and symbols (though keep in mind that some editors, teachers, and professors still prefer them)....
https://www.touro.edu/departments/writing-center/tutorials/the-apostrophe/
6 Minute English / The decline of the apostrophe - BBC
...A retired journalist who founded a campaign to preserve the correct use of the apostrophe in the English language, is giving up his battle. It's because he says "ignorance has won"....
https://www.bbc.com/learningenglish/english/features/6-minute-english/ep-200109
Writing and Communication Centre - University of Waterloo
...If the singular noun ends in s, you can choose whether to add ?s or just an apostrophe. It doesn?t matter which you choose, but you should be consistent throughout your piece of writing....
https://uwaterloo.ca/writing-and-communication-centre/apostrophes
How to use apostrophes in contractions - BBC Bitesize
...Contractions are two words that are joined together. An apostrophe shows that letters have been left out. Find out more with this Bitesize 1st level English and literacy guide....
https://www.bbc.co.uk/bitesize/articles/z4cqkty
Apostrophe Rules - pittstate
...Occasions when you might think you need an apostrophe but you really don?t? Apostrophes are used to create possessive nouns?or more correctively to turn nouns into adjectives....
https://www.pittstate.edu/office/writing-center/apostrophe-rules.html