The study of word roots is "etymology." English dictionaries give the etymology of English words.

Word roots are not useful to beginners.

1) Knowing Latin and Greek roots is helpful to well-educated native speakers.

It is helpful with specialized technical vocabulary. Doctors use advanced medical vocabulary. Many medical words are based on Latin and Greek roots: <em>nephritis</em>, <em>cerebellum</em>, <em>sphygmomanometer.</em> Medical students learn "Medical Greek and Latin." It helps them remember the meanings of these terms.

2) Spanish, Italian, and French come from ancient Latin. Many English words also come from ancient Latin. So, some words from Latin are almost the same in Spanish and English. They are called "cognates." For example, <em>cerebro</em> and <em>cerebrum,</em> <em>nación </em>and <em>nation,</em> <em>pasto</em> and <em>pasture, ciencia</em> and <em>science. </em>These are useful to native speakers of these languages. There are almost no cognates between Chinese and English. They are not useful for Chinese speakers.

Can you tell me if native English speakers use word roots to remember the words?

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I don't know if knowing the root of a word can help you remember the word, but it can help you understand the word.

Here are three examples of common roots:

Root word Meanings Origin Examples and Definitions

act do Latin activity - something that a person does;

react - to do something in response;

interaction - communication between two or more things

ann/enn year Latin anniversary - a date observed or celebrated once a year;

annual - happening once a year;

millennium - 1,000 years

bi/n two

twice Latin bicycle (2 cycles/wheels)

binoculars - optical device with two lenses;

binary – something that involves two things (binary numbers 0 and 1)

biannual - happening twice a year; 

bilateral - of or involving two sides

The examples above come from this website:

Thank you all of you .