this的复数形式是什么

"this"的复数形式是"these"。在英语中，"this"表示单数，而"these"则表示复数，用来指代多个事物。例如，"This is a book"（这是一本书）变为复数形式就是"These are books"（这些是书）。

The plural form of the word 'this' is 'these'. This change is a fundamental aspect of English grammar, allowing us to refer to multiple items or subjects.

Rules for Forming Plurals

General Rule: Most nouns form their plurals by adding an '-s' at the end of the word.

• Examples: map → maps, boy → boys, horse → horses, table → tables

Exceptional Rules:

• Words ending in s, o, x, sh, or ch often add '-es'.
• Examples: class → classes, box → boxes, hero → heroes, dish → dishes, bench → benches
• Some words ending in 'o' only add '-s', such as photo → photos, piano → pianos.
• Words ending in a consonant followed by 'y' change 'y' to 'i' and add '-es'.
• Examples: family → families, city → cities, party → parties
• Words ending in 'f' or 'fe' change 'f' or 'fe' to 'v' and add '-es'.
• Examples: shelf → shelves, wolf → wolves, life → lives, knife → knives

Irregular Changes:

• man → men, woman → women, sheep → sheep, tooth → teeth, fish → fish, child → children, ox → oxen, goose → geese

Uncountable Nouns: These nouns do not have a plural form and require quantifiers to indicate quantity.

• Examples: a bag of rice → two bags of rice, a piece of paper → three pieces of paper, a bottle of milk → five bottles of milk

Usage of 'These'

The plural form of 'this is' is 'these are'. It is incorrect to say 'these is'.

Example Sentence: "These are difficult times for everyone." This sentence translates to "对我们每个人来说，这是非常艰难的时期."

Extended Knowledge

'These' can function as a determiner, pronoun, or adjective, as follows:

• Determiner: Refers to plural people or things, equivalent to "these" in Chinese.
• Pronoun: Refers to plural people or things, equivalent to "these" in Chinese.
• Adjective: Modifies plural nouns, equivalent to "these" in Chinese.
• Examples: "These students are very talented." "I like these books." "These days are very busy."