Prototypes and plural forms of English words The more, the better,

Prototypes and plural forms of English words The more, the better,

In the plural form of a noun, s or ES is usually added after the singular form. The rules of formation and pronunciation are listed as follows: add - s at the end of the word 1. Read as [S] after the clear consonant 2. Read as [Z] desk desks [S] map maps [S] field – files [DZ] dog dogs [Z] se after the voiced consonant

How do these English words become plural?
species medium phenomenon analysis means

The plural number of species remains unchanged
Medium [plural] medium or mediums
Phenomenon [plural] phenomena
Analysis
The complex number of means is invariant

Rules of changing singular sentences into plural sentences

The subject becomes plural, the predicate verb does not use the third person singular, if there is an auxiliary verb, it should be changed into other corresponding forms

Add plural or singular after none? Give an example

Plural
None of them is good at Maths.