—Who is singing in the classroom? 谁在教室里唱歌？ —Helen is. 海伦在(唱歌)。
—What is he looking for? 他在寻找什么？ —He's looking for juice. 他在找果汁。
—Where are you having lunch? 你们在哪里吃午餐？ —At school. 在学校。
—What are you doing? 你们在做什么？ —We're doing housework. 我们在做家务。
将现在进行时的陈述句转换为特殊疑问句时，首先，确定特殊疑问词(what，where，why等)；然后，将特殊疑问词代入特殊疑问句结构，即“特殊疑问词＋be动词(＋主语)＋动词 - ing形式(＋其他)？”。
注意：画线部分不可以出现在提问的句子中。如：
She is brushing her teeth.(对画线部分提问)→What is she doing?
It is running on the floor.(对画线部分提问)→Where is it running?
His friends are walking.(对画线部分提问)→Who is walking?
I am teaching Tim English.(对画线部分提问)→Who are you teaching English?

—Are you cooking dinner? 你在做晚饭吗？ —Yes，I am. 是的，我在(做)。
—Is Tim watching TV in the living room? 蒂姆在客厅里看电视吗？
—No，he isn't. 不，他没在(看电视)。
将现在进行时的陈述句转换为一般疑问句时，可以记住“一提、二改、三问号”，即将be动词提前，第一人称代词改为第二人称代词(部分句子还要将some改为any)，最后在句末加上问号。如：
I am doing my homework now. 我现在正在做我的家庭作业。
→Are you doing your homework now? 你现在正在做你的家庭作业吗？
She is eating some rice. 她正在吃一些米饭。→Is she eating any rice? 她正在吃一些米饭吗？

一、将下列句子改为一般疑问句，并分别作肯定和否定回答。
1. I'm watching a cartoon film in the living room.
—________ ________ ________ a cartoon film in the living room?
—Yes，________ ________./No，________ ________.
2. Yang Ling is cooking dinner with her parents.
—________ Yang Ling cooking dinner with her parents?
—Yes，________ ________./No，________ ________.
3. My brother is writing a letter to his friend.
—________ ________ ________ ________ a letter to his friend?
—Yes，________ ________./No，________ ________.
二、根据中文提示完成对话。
1. ——你在洗衣服吗？ ——不是。我在做家庭作业。
—________ you ________ ________? —No. ________ ________ my ________.
2. ——他现在在游泳吗？ ——是的，他在。
—________ he ________ now? —Yes，________ ________.
3. ——他们在秋千上玩吗？ ——不是，他们没在(秋千上玩)。他们在操场上跑和跳。
—________ ________ ________ on the swing?
—No，________ ________. ________ ________ and ________ on the ________.
4. ——她在卧室整理床铺吗？ ——是的，她在(整理床铺)。
—________ ________ ________ the bed in the ________?
—Yes，________ ________.
三、按要求写句子。
1. Jack and Mike are playing basketball. (对画线部分提问)
______________________________
2. Helen is drawing pictures in the study. (对画线部分提问)
______________________________
3. That doctor is helping sick people. (对画线部分提问)
______________________________
4. What is she doing? (看图回答问题)
______________________________
5. what；the children；doing；picnic (看图并根据提示写对话)
______________________________

一、1. Are you watching; I am; I’m not
2. Is; she is; she isn’t
3. Is your brother writing; he is; he isn’t
二、1. Are; washing clothes; I’m doing; homework
2. Is; swimming; he is
3. Are they playing; they aren’t; They’re running; jumping; playground
4. Is she making; bedroom; she is
三、1. What are Jack and Mike doing? 解析：题干句意：Jack和Mike正在打篮球。对正在做的事情提问用疑问词what，又因为是现在进行时，故填“What are Jack and Mike doing?”。
2. Where is Helen drawing pictures? 解析：因为画线部分是“在书房”，是地点，所以疑问词用where，后接现在进行时的一般疑问句，故填“Where is Helen drawing pictures?”。
3. Who is helping sick people? 解析：画线词为“医生”，是人，所以疑问词用who，故填“Who is helping sick people?”。
4. She is washing the dishes. 解析：根据图片可知，女孩正在洗碗，故填“She is washing the dishes.”。
5. —What are the children doing? —They are having a picnic. 解析：根据图片可知，孩子们正在野餐，再根据给出的词汇可知对话是：——孩子们正在干什么？——他们正在野餐。故填“—What are the children doing? —They are having a picnic.”。