1. Add es after words ending in s, x, ch, sh and z, for example, bus-busses; watch-watches。

2. If the consonant letter ends with Y, change Y into I and add es, for example, baby-babies；; lady-ladies。

3. Add es after some words ending in O, for example, potato-potatoes；; hero-heroes。

4. Generally, words ending in F and fe should change F or fe into ves, for example, wife-wives；; knife-knives。

Extended data:

Irregular change

1. Child-children foot-feet teeth-teeth

Mouse-mice -women-women

.

but German is not a compound word, so the plural form is Germans；; Bowman is a surname, and its plural is the Bowmans.

2, simplex homomorphism,

such as deer, sheep, fish, Chinese, Japanese, li, jin, yuan, two li, three mu, four jin, etc.

But except the yuan, jiao and fen of RMB, the dollar, pound and franc all have plural forms.

such as: a dollar, two dollars; a meter, two meters。

3. Collective nouns appear in singular form, but they are actually plural. For example,

people police cattle and so on are themselves plural numbers, and you can't say a people, a police, a cattle, but you can say a person, a policeman, a herd of cattle.