MAY I ASK IF THERE IS A RESTAURANT CALLED FRIDAY S, WHY DO YOU HAVE TO ADD S TO THE BACK, AND MCDONA

This is a kind of grammar used in different places to have different meanings, the latter point is the abbreviation of is the meaning of yes, also read apostrophe (is a comma, the meaning of the decimal point) for example: McDonald's after the S is a negative number means that it means that there is more than one McDonald's (that is, it has more than 2 or more branches), for example: father'S day (Father's Day) here does not mean a negative number, but the affiliation refers to the "of" holiday of the father (to put it simply, it means).

I don't know if you can understand this explanation?! Because the grammar thing is too difficult to explain, I try my best to hope that you will find your own answer as soon as possible.

It's like a Japanese restaurant called Yoshinoya, and this is McDonald's and Friday.

xx's means xx in English.

Disagree with ZPLPTP.

S should be a colloquial thing, indicating a large scale and a regular store.

Just like the "big" in Chinese "XX big restaurant".

...For example, grandma's home is grandmother's

friday's should be the same usage as this one.

It means that it was opened by McDonald's, which means "McDonald's".

Possessive form, which denotes ......Target.

s is an abbreviation for I S and also means of .

This one. In English, it is called the "noun possessive" and is a form of grammar.

There are many specific situations in which this can be applied.

1.Add after noun'S is used to denote a living person or thing.

2.The noun is also added when it means time, distance, weight, price, country, group, or city's to represent all relationships.

Such as: a day's work, two miles'distance, Japan's industry (Japanese industry).

3.Anthropomorphic non-biological nouns are added after nouns when denoting all relationships's to denote as follows:

world's history, fortune's favorite.

8.Add after noun'The form s is generally omitted when used in possessive nouns such as house, shop, home, store, etc.

Add after noun'The form s is generally omitted when used in possessive nouns such as house, shop, home, store, etc. Such as: uncle's (house).

5.The possessive case common to two or more nouns indicates joint possession; or when the possessive case of two or more nouns is used to indicate their respective possession, it is added after the noun's, such as:

John and Mary's school (John and Mary's school) (in the same school).

John's and Mary's schools (John's School and Mary's School) (two schools).

If the possessive noun is repeated with the noun that follows, the former can be omitted and the first noun can be added after it's。

and so on, see References for a more detailed explanation.

Possessive form, which denotes ......Target.

It means that there are many xx restaurants around the world.

Hey, what else can I say?