题目内容
8．useful，learnLearning English is useful．
分析 学习英语是有用的．
解答 答案：Learning English is useful．图片上一本英语书，useful有用的，learn学习，故造句学习英语是有用的．表达的是客观事实用一般现在时，动名词短语Learning English 作为主语，谓语动词用单数is，故答案是Learning English is useful．
点评 动名词做主语 （动名词做主语往往表示经常性、习惯性的动作．此时，谓语动词用单数形式）
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