In fact, the basic knowledge of word formation in junior high school English vocabulary is also very beneficial than that in primary school, that is, it can make us easily know more words, skillfully expand our vocabulary and remember more words in a short time. Today, we learn how to memorize words quickly with Bian Xiao from a training institution. There are three main word-formation methods of junior high school English vocabulary, namely, conversion method, synthesis method and derivation method. 1. transformation: In English, the method of transforming a word from one part of speech to another or several parts of speech without changing its form is called transformation. 1. The verb becomes a noun. They are only allowed to sell soft drinks at school. At school, they are only allowed to sell non-alcoholic drinks. The noun became a verb. The smell in the kitchen made his mouth water. The smell of the kitchen made his mouth water. We will try our best to improve our living conditions. We should try our best to improve our living conditions. Second, the synthesis method: connect two or more words together to synthesize a new word. This word formation is called synthesis, and the synthesized words are called compound words. Compound words usually know their meaning by looking at the words. 1. compound noun noun/pronoun+noun newspaper blood test female wolf verb+noun typewriter pickpocket dawn 2. Compound adjective noun+adjective/adjective+noun world famous tax-free large-scale long-term adverb+adjective excessive anxiety evergreen tree 3. Compound verb noun+verb nanny sleepwalking adverb+verb unknown o. Verwork adjective+verb whitewash 4. Comprehensive adverb adjective+noun at the same time anyway adjective+adverb everywhere anyway 3. Derivative words: new words with similar or completely opposite meanings to the original words are called derivative words. 1. prefix: Except for a few prefixes, prefixes generally change the meaning of words, but do not change the part of speech of words. The prefix-[il- (before the letter L), im- (before the letters M, B, P) and ir- (before the letter R) in (1) is unbalanced and irregular (2) indicates the prefix en-? Manufacturing? Enrich, expand and encourage interest? Mutual? International Intercontinental II. Suffix (1) adjective suffix -able? Yes, there is. Acceptable, drinkable, knowledgeable and reasonable? What is it related to? Physics, Magic, Politics (2) Noun Suffix-er/or? Table people or utensils? Farmers, bakers, tourists, professors, chefs, containers? Of a certain country (person)? China, Japanese? People from a certain country or place; A proficient person? Musicians, Asians, Russians, Technology (3) Verb suffix -fy/ify? Manufacturing; Become? Simplify, beautify and purify -en? Make into; Become? Shorten, deepen and grieve? Make it? Apologize, recognize and specialize (4) adverb suffix -ly? Way, degree? Free, true, and angry? Where to? Tower, Forward, Up (5) Numeric suffix -teen? A dozen? Fourteen, eighteen, thirteen? Ten digits? Forty, fifty, sixty? Ordinal number? Twelfth and twentieth times