小学英语中的现在进行时是表示当前或现阶段正在进行的动作或存在的状态。这个时态由"be"动词（am/is/are）加上动词的现在分词形式构成。现在分词通常是在动词后加上"-ing"来形成，例如：think-thinking, sleep-sleeping, study-studying。
对于动词现在分词的构成有以下规则：
1. 大多数动词直接加"-ing"，如：think-thinking。
2. 以不发音的字母"e"结尾的动词，去掉"e"再加"-ing"，如：come-coming, make-making, have-having。
3. 以重读闭音节结尾且呈现"辅，元，辅"结构的动词，双写末尾的辅音字母再加"-ing"，如：stop-stopping, sit-sitting, run-running。常见的此类动词还有begin, cut, get, hit, run, set, sit, stop, swim等。
4. 以"ie"结尾的动词，将"ie"改为"y"，再加"-ing"，如：die-dying, lie-lying。
现在进行时的用途包括：
1. 描述说话时正在进行的动作，例如："Mother is cooking in the kitchen."（妈妈在厨房里煮饭。）
2. 表示现阶段正在进行但说话时不一定会持续的动作，例如："Is she writing a novel?"（她正在写一本小说吗？）
3. 表示按计划或安排即将发生的动作，比如："I’m going home in half an hour."（我一个半小时内要回家。）常见适用于这种情况的动词有go, come, leave, start, arrive等。
现在进行时的句型变化如下：
- 肯定式：主语+be动词+动词-ing+其他，如"We are running now."（我们现在正在跑。）
- 否定式：主语+be动词+not+动词-ing+其他，如"They aren’t doing their homework."（他们没在做作业。）
- 一般疑问句：Be动词+主语+动词-ing+其他？如"Is she having English lesson?"（她在上英语课吗？）肯定回答"Yes, she is."，否定回答"No, she isn’t."
- 特殊疑问句：疑问词+be动词+主语+其他？如"What is he doing now?"（他现在在做什么？）回答"He is swimming."（他正在游泳。）
基础练习题答案：
1. The boy is drawing a picture now.
2. Listen. Some girls are singing in the classroom.
3. My mother is cooking some nice food now.
4. What are you doing now?
5. Look. They are having an English lesson.
6. They are not watering the flowers now.
7. Look! The girls are dancing in the classroom.
8. What is our granddaughter doing? She is listening to music.
9. It’s 5 o’clock now. We are having supper now.
10. Is Helen washing clothes? Yes, she is.
写出下列动词的现在分词形式：
work-working, sing-singing, play-playing, study-studying, have-having, dance-dancing, write-writing, take-taking, run-running.
