新概念2A总复习Part 1 时态1、 现在进行时：表示说话时正在做的事情1、基本结构：be+doing （do代指所有动词原形）肯定句：主语+am/is/are+doing. My mother is talking with the dentist.否定句：主语+am/is/are not+doing. They arent playing games.一般疑问句：Is/Are+主语+doing.? Yes,主语+am/is/are. Is she waiting for a bus? No,主语+am/is/are not.特殊疑问句：特殊疑问词+is/are+主语+doing.? Where are they doing their homework?2、 动词现在分词变化规则：1) 一般情况下,直接在动词后加ing? work - working sleep - sleeping? study - s
