题目内容
19．The government has warned kidsnot to swim （ not swim ） in the rivers in the summer vacation．分析 在暑假政府警告孩子们不要在河里游泳．
解答 答案：not to swim．
根据The government has warned kids--（ not swim ） in the rivers in the summer vacation，可知在暑假政府警告孩子们不要在河里游泳．warn sb to do sth表示警告某人做某事，否定形式在to前面加not．故填not to swim．
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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