题目内容
5．All the children are oftenwarned （warn） not to swim alone in the river．分析 --所有的孩子都经常被警告不要独自一人在河里游泳．
解答 答案：warned 考查单词填空．根据题干：All the children are often （warn） not to swim alone in the river．--所有的孩子都经常被警告不要独自一人在河里游泳．根据句意是事实，所以时态是一般现在时，主语是动作对象，故用被动语态，构成 是be+过去分词，warn的过去分词是warned．
点评 考查单词填空．准确的翻译句意及分析句子结构、时态等是关键，然后再用合适的形式完成句子．
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