题目
Word Formation-|||-Conversion-|||-English words are usually formed in four ways:-|||-affixation(词缀法)including prefixation (前缀法),such as impossible,rewrite, and suffixation-|||-(后缀法),such as useful,visually, pursuer,motivation;-|||-compounding (合成法), such as software,wellknown,3-year-old;-|||-abbreviation(缩略法),such as DJ,USA;-|||-conversion(词性转换法).-|||-Conversion is done when a word changes its class without any change of its form.Its typical-|||-cases include noun →verb,verb →noun,adjective →noun and adjective→verb,such as-|||-tutorn.→V. change v.→n. red adj.→n. lower adj.→V.-|||-In the text there are some words used in the same way.Can you find any of them?And can you list-|||-any other words like them?

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