English, what do you mean, when to use OF and when to use S?

(1) singular nouns: add at the end. For example: schoolbags for boys.

(2) plural nouns: add s to the suffix without s, such as children's toys; ; Suffixes with s+, such as "Nvshu".

(3) Many people have * * *: add after the last noun. For example, Jim and Kate's room.

Solely owned: add after each noun. For example: Jane and Tom's books. (Jane's book and Tom's book)

2. For inanimate words

(1) means time, distance, price and weight: add at the end of the word. For example, today's news, walking 1000 meters, weighing 5 pounds.

(2) Nouns representing countries, the world, cities and other places: suffix addition. Such as: the first train in China, the world population, and the theme parks in Beijing.

(3) Other inanimate nouns except the above two cases: of+ nouns. For example: the window of the room, the cover of my book.

Extended data

Noun possessive case indicates a kind of "belonging" relationship, which is often expressed by "de" in Chinese. It has two forms: one is to add s after nouns; The second is to add nouns after the preposition of.

The possessive case can represent other relationships except the ownership relationship.

(1) indicates the subject-predicate relationship. For example:

The enlistment of soldiers

The arrival of the train

(2) Represents the verb-object relationship. For example:

Family support supports the family.

Children's education is the education of children.

(3) indicates modifying the relationship. For example:

doctor's degree

One month's salary

Omission of possessive case

(1) indicates a place noun such as a clinic, a shop or someone's home, and the modifiers after the possessive case of the noun are often omitted. For example:

I was at my aunt's house yesterday afternoon. I was at my aunt's house yesterday afternoon.

She went to the hair salon. ? She went to the barber shop.

(2) Words modified by the possessive case of nouns can usually be omitted to avoid repetition if they have been mentioned before. For example:

Whose mobile phone is this? This is Tom's. Whose mobile phone is this? This is Tom's.

The flashlight is not mine, but Jack's. ? The flashlight is not mine, but Jack's.