题目内容
16．Jack's already back from work．（改为一般疑问句）Is Jack back from workyet？
分析 杰克已经下班回家了．杰克下班回家了吗？
解答 正确答案：Is，yet．本句Jack's…，此处's是系动词is的缩写，变为一般疑问句直接将is放在句首，故第一空应填写Is．其次already表示已经，常用于肯定句，否定句和疑问句则常用yet，故第二空填写yet．
点评 本题考查句型转换，基础题，但部分同学看到's及already觉得此句是现在完成时态，所以做题时一定要仔细审题，最后注意首字母要大写．
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