现在进行时一、构成 be（am/is/are）+动词的现在分词二、句型结构：肯定句否定句疑问句 简要回答I am studying. I am not studying.Am I studying? Yes，I am/ No，I am not.三、现在分词的构成规则1）一般情况， 在动词后加ing，例词work-working，study-studying，go-going2）以不发音的e结尾，去e再加-ing，例词have-having，live-living，take-taking3）重读闭音节，只有一个辅音字母结尾，双写该辅音字母，再加-ing，如get,sit, cut, hit, put, forget, run, begin, swim, shop, stop, prefer.例词cut-cutting stop-stopping，forget-forgetting，begin-beginning4）以ie结尾，变ie为y再加-ing，例词die-dying，lie-l
