Tigers      eat fruits and the camel      eat meat .
A.don’t ; doesn’tB.doesn’t ; don’t
C.don’t ; don’tD.doesn’t ; doesn’t
A

試題分析:在一般現(xiàn)在時(shí)態(tài)中,當(dāng)句子中有行為動(dòng)詞時(shí),應(yīng)該用結(jié)構(gòu):當(dāng)句子的主語(yǔ)為非三單形式時(shí),要借助于助動(dòng)詞do,其結(jié)構(gòu)為:主語(yǔ)+don’t 動(dòng)詞原形+其他;主語(yǔ)是三單時(shí),其結(jié)構(gòu)是主語(yǔ)+doesn’t+動(dòng)詞原形。當(dāng)句子中沒有行為動(dòng)詞時(shí),要在be 動(dòng)詞后面加not。根據(jù)選擇項(xiàng)的提示可知eat是行為動(dòng)詞,且主語(yǔ)是tigers和the camel前者要用don’t,后者要用doesn’t,故選A。
點(diǎn)評(píng) :學(xué)生要注意一般現(xiàn)在時(shí)句子中行為動(dòng)詞的否定句的構(gòu)成,尤其特別是當(dāng)主語(yǔ)為三單形式時(shí)謂語(yǔ)動(dòng)詞的否定句結(jié)構(gòu),謂語(yǔ)動(dòng)詞要用原形。
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