自主高效練八年級(jí)英語(yǔ)外研版評(píng)議教輔
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20. I have made up my mind to take a break from social media.（改為同義句）
I have
decided to
take a break from social media.
答案：decided to
解析：“make up my mind”意為“下定決心”，其同義短語(yǔ)為“decide to”，原句時(shí)態(tài)為現(xiàn)在完成時(shí)，所以此處用“decided to”。
21. My grandparents have already been to Sanya.（改為否定句）
______
答案：My grandparents haven't been to Sanya yet.
解析：現(xiàn)在完成時(shí)的否定句是在助動(dòng)詞“have/has”后加“not”，“already”在否定句中通常改為“yet”，放在句末。原句主語(yǔ)是“My grandparents”，助動(dòng)詞用“have”，所以否定句為“My grandparents haven't been to Sanya yet.”。
22. People have improved air quality in the cities by driving less.（改為一般疑問(wèn)句）
______
答案：Have people improved air quality in the cities by driving less?
解析：現(xiàn)在完成時(shí)的一般疑問(wèn)句是將助動(dòng)詞“have/has”提到主語(yǔ)之前，原句主語(yǔ)是“People”，助動(dòng)詞用“have”，所以一般疑問(wèn)句為“Have people improved air quality in the cities by driving less?”。
23. There will be life on that planet.（用現(xiàn)在完成時(shí)改寫(xiě)句子）
______
答案：There has been life on that planet.
解析：現(xiàn)在完成時(shí)的結(jié)構(gòu)為“have/has+過(guò)去分詞”，“there be”句型的現(xiàn)在完成時(shí)為“There have/has been...”，“l(fā)ife”是不可數(shù)名詞，所以用“has been”，改寫(xiě)后的句子為“There has been life on that planet.”。
24. writer，David，a，has become，successful（.）（連詞成句）
______
答案：David has become a successful writer.
解析：根據(jù)所給單詞，“David”是主語(yǔ)，“has become”是謂語(yǔ)，“a successful writer”是賓語(yǔ)，所以連成的句子為“David has become a successful writer.”。
