当空格处所需词类与括号中所给词的词类不同时，就需要词类转化。我们可据以下3条规则顺利解题： (1)作主语或宾语用名词形式；(2)作定语、表语或补足语用形容词形式；(3)修饰动词、形容词或另一副词，作状语，用副词形式。具体解题技巧如下： 第一步：分析结构，确定要填的词在句中充当哪种句子成分。在名词前作定语、在系动词后作表语、作主语和宾语的补足语，一般要用形容词；修饰动词、形容词或副词，或修饰整个句子，作状语，用副词；作主语或宾语用名词，或者在冠词、形容词性物主代词或名词所有格后，用名词。 第二步：根据构词法将括号中的词变成所需要的词类。 注意： 1. 有时不但要注意词性转换，而且还要考虑用表示相反意义的前缀或后缀， 其逻辑意义才通顺； 2. 当所给词的词性与空格处所需词的词性相同时， 无需改变词性， 就可能是加只改变词义但不改变词性的前缀了。 形容词→副词 wide→widely 形容词→形容词比较级/最高级 wide→wider/widest 形容词→名词 wide→width 形容词→动词 wide→ widen 动词→名词 instruct → instruction (s) 特殊变性 happy →happily, simple →simply， true →truly, arrange →arrangement， judge →judgment 1.【2019·全国 II卷】Her years of hard work have _____(final)been acknowledged after a customer nominated(提名)her to be Cheshire's Woman Of The Year. 2【2019·全国卷I】It is difficult to figure out a global population of polar bears as much of the range has been _____ (poor) studied. 3. 【2019·全国卷I改编】It leads to a _____ (believe) that populations are increasing 4. 【2019·浙江卷】Other American studies showed no _____ (connect) between uniforms and school performance. 5.【2019·浙江卷】School uniforms are _____ (tradition) in Britain, but some schools are starting to get rid of them. 6.【2018·全国卷I I】According to the World Bank, China accounts for about 30 percent of total _____ (globe) fertilizer consumption. 7.【2018·全国卷III】I'm a _____ (science) who studies animals such as apes and monkeys. 8. 【2018·全国卷I】Running is cheap, easy and it’s always (energy). 9.【2017·全国卷I I】This development was only possible with the _____ (introduce) of electric-powered engines and lifts. 10. 【2019·浙江卷改编】When the children are walking to school on dark mornings, car drivers can _____ (easy) see them. 11. She took the job for _____（variety）reasons. 12. It (eventual) became China’s primary faith, more widespread than the original Chinese religions of Confucianism and Taoism. 13. When they were free from work，they invited us to local events and let us know of an interesting _____(compete) to watch，together with the story behind it. 14. The obvious one is money; eating out once or twice a week may be (afford) but doing this most days adds up. 15. He explained that he tried to _____ (simple) the show and ensured the piglet is unforgettable. 16. The _____ (produce) made his fortune thanks to the young peppa pig. 17. Now that you are able to take up arms and protect your motherland，we are all_____（pride）of you. 18. I suggest we should find new ways to protect the _____（endanger）animals. 19. In the course of _____（evolve），some birds have lost the power of ... ...
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