What are the words that add s directly, and what are the 20 words that add s directly?

boys，days，toys.1. Generally add s

2. Add es to words ending in s, x, sh, ch.

3. Write with vowel letters.

Words ending in y directly + s: boys, days, toys.

4. If it ends with a consonant + y, change y to i, and then add es: cities, babies, factorie.

5. If the noun ends in +o, there is life, such as potato, then add -es; Inanimate, such as photo, add s directly. There are very few nouns that end in -o or -f, and only -s are added to the plural, such as radiospianosphotosroofs.

In general, s is added directly, and words ending in s, x, sh, and ch are added to es. Nouns plus s or es express the plural form of nouns, not all nouns add s or es to the plural, only countable nouns.

There is a plural form.

1. Most potato coarse numbers add s, such as: books.

2. End with y to y plus ies, baby-babies.

3. Change to ves or add s directly at the end of f or fe. Such as: knife-knives, roof-roofs.

4. When ending with o, the living noun adds es, and the inanimate adds s, such as: tomato-tomatoes, photo-photos.

5. Change the internal vowel letters, such as goose--geesefoot--feetman-men.

6. Homomorphism, such as Chinese--Chinese, fish-fish, sheep-sheep, Chinese--Chinese.

7. Special changes: child-children, mouse-mice.

rat，bull，tiger，rabbit，dragon，snake，horse，goat，monkey，hen，dog，pig，pen，key，phone，computer，book，umbrella，door，mask，car，bike，doctor，nurse，pill。The above words are directly added with s.

eye,hour,umbrella,elephant,apple,angle,american,island,an old man,orange,answer,idea,actor actress,engineer,inventor,airplain,industry,agreement( protocol), artical, office, event, understanding, age, opinion, enemy, address, apartment, 18 (eighteen), accident, orphan, assistant, apology, emergency ,explanation(Explanation)胡好,an interesting exciting story(一interesting excitingия история), excellent(excellent), honor(honor), excuse(excuse).

If it is the plural of countable nouns, it is necessary to add s or traces of the state edge.

If it is an action verb, generally the subject of the present tense is the third verbal singular number, and the s or es should be added.

he goes to school on foot every day.

If the subject of the verb is the third cons of the third cons of the hunger personal singular implicit draft, the predicate verb in the present tense generally has to add s or es

If it is the plural of a countable noun, add s

As. he has three books