题目内容
20.The baseballs are on the desk.(变为否定句)The baseballsaren't on the desk.
分析 --棒球在桌子上.
--棒球不在桌子上.
解答 答案:aren't.考查否定句.本句含有be动词are,变否定句在are后直接加not,are not缩写为aren't.因此答案是aren't.
点评 考查否定句.通常是在be动词,情态动词后加not.一般现在时态,主语不是第三人称单数用don't,主语是第三人称单数用doesn't.一般过去时态用didn't.还有其它用法需要牢记.
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