题目内容
2.His parents have already known what has happened.(变为否定句)His parentshaven't known what has happenedyet.
分析 翻译:他的父母已经知道了发生的事情.他的父母还不知道发生的事情.
解答 肯定句变否定句的变化规则:在助动词后加not,本句助动词为have,所以加not缩写成haven't,同时需把already变成yet.故答案为:haven't; yet
点评 本题考查现在完成时的肯定句变否定句,做此类题时,在have/has后加not,并缩写成haven't/hasn't.同时注意already只用于肯定句,变否定或疑问时需变成yet.
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