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三谈词汇量问题:掌握构词法学习英语的人,学会几百个词汇之后,就会发现:许多单词开头的两三个字母有时是一样的。例如:return,retell,react 等单词,前两个字母都是 re-;misuse,mistake,misunderstanding 等单词,前三个字母都是 mis-。如果去掉这些相同的字母,剩余部分还是一个单词,即:turn,tell,act;use,take,understanding 等等。这些相同的字母,放在词干之前,构成一个新词,并使该词改变词义,称为前缀(prefix)。英语有大约40个常用前缀,利用这些前缀,可以派生出许多新的单词。只要查一下一本中等规模的词典,就会发现,光是通过加前缀 un-构成的单词就会有好几百个。
Third, talk about vocabulary problems: After mastering people who learn English using word formation and learning a few hundred vocabulary words, they will find that the first two or three letters of many words are sometimes the same. For example: return, retell, react, and other words, the first two letters are re-; misuse, mistake, misunderstanding and other words, the first three letters are mis-. If you remove these same letters, the rest is still a word, namely: turn, tell, act; use, take, understanding, and so on. These same letters, placed before the stem, form a new word, and make the word change its meaning, called the prefix. English has about 40 commonly used prefixes. Using these prefixes, many new words can be derived. As long as you check a medium-sized dictionary, you will find that there are hundreds of words formed by prefixing un-.