When you have a non defining relative clause. eg
Jacks house, which has been on the market for years, has just been sold.
In this sentence the words between the commas are called a non defining relative clause. The clause gives extra (but not essential) information about the subject. The relative clause can be omitted. If the non defining clause is omitted the sentence will still make sense.
When you have a defining clause no commas are used and the clause gives essential information to identify who or what you are talking about.
The house which I showed you last week has just been painted
No, you do not need to use an apostrophe in the sentence "I have two cousins." Apostrophes are typically used to show possession or to indicate missing letters in contractions.
Inches is shown by two apostrophes (").
Here is the sentence with the apostrophes: You can't belive she didn't go?
Apostrophes and quotation marks can be used interchangeably.
If the apostrophes are appropriately used, there's no problem with using two in one sentence. If possible, try to switch wording to eliminate the need for a possessive. For example: After stopping briefly at Tom's office and George's gallery, the two men and their wives headed to see a Broadway play.
The apostrophes when used in the Latin language serve many purposes. These apostrophes are punctuation marks that sometimes serve as diacritic marks that show possession.
The two types of apostrophes are the straight apostrophe ('), which is used to show possession or contraction, and the curly or typographic apostrophe (’), which is a more visually appealing version of the straight apostrophe.
One must have worked - it shows in your question !
This is incorrect. Apostrophes are not used to make plural words singular. Apostrophes are used to show possession or to indicate missing letters in contractions. Plural words are formed by adding "s" or "es" depending on the word.
That would be a ditto mark.
Apostrophes are punctuation marks used to indicate possession or contraction. For example, "Mary's book" shows possession, while "can't" is a contraction of "cannot." It's important to use apostrophes correctly to avoid confusion in writing.
It should be: The boys' toilets are disgusting.