三、按照要求完成句子。
1. They are playing football.(变成一般疑问句)

2. Are they doing the long jump?(作否定回答)

3. Are you watching the games?(作肯定回答)

4. What are the boys doing?(用play ping-pong回答)

1. Are they playing football?
2. No, they aren't.
3. Yes, I am /we are.
4. They are playing ping-pong.

【分析】
本题考查现在进行时的句型转换及回答，解题思路如下：1. 现在进行时陈述句变一般疑问句，需将be动词提至句首，其余部分语序不变；2. 现在进行时一般疑问句的否定回答，结构为“No, 主语+be动词+not”，be动词与not可缩写；3. “Are you...?”的肯定回答，需根据实际情况用I或we作主语，搭配对应的be动词am或are；4. 特殊疑问句问正在做的事，回答需用现在进行时，主语替换为代词，动词用现在分词形式。
【解析】
1. 原句为现在进行时（be+doing），变一般疑问句时将be动词are提至句首，其余部分不变，得到：Are they playing football?
2. 一般疑问句“Are they...?”的否定回答，主语用they，be动词are加not缩写为aren't，得到：No, they aren't.
3. 一般疑问句“Are you...?”的肯定回答，主语用I或we，对应be动词am或are，得到：Yes, I am /we are.
4. 特殊疑问句问“the boys正在做什么”，回答用现在进行时，主语the boys替换为they，动词play的现在分词为playing，得到：They are playing ping-pong.
【答案】
1. Are they playing football?
2. No, they aren't.
3. Yes, I am /we are.
4. They are playing ping-pong.
【知识点】
现在进行时、一般疑问句、特殊疑问句回答
【点评】
本题围绕现在进行时的基础句型展开，考查学生对一般疑问句、特殊疑问句的转换及回答规则的掌握，是英语语法学习中的基础题型，适合巩固核心知识点。
【难度系数】
0.3

四、看图,和同桌一起说一说。

示例：
1.
Girl: Are they playing basketball?
Boy: Yes, they are.
2.
Girl: Are they playing ping-pong?
Boy: Yes, they are.
3.
Girl: Are they running?
Boy: Yes, they are.
4.
Girl: Are they doing the high jump?
Boy: Yes, they are.
5.
Girl: Are they playing games?
Boy: Yes, they are.

【分析】首先观察每一幅插图的活动内容，确定对应的英语表达；接着使用“Are they + 动词-ing形式？”的一般疑问句结构针对图中活动提问；最后用“Yes, they are.”作肯定回答，完成对话练习。
【解析】先逐一识别图片活动：第一幅图是打篮球，对应表达playing basketball；第二幅是打乒乓球，对应playing ping-pong；第三幅是跑步，对应running；第四幅是跳高，对应doing the high jump；第五幅是玩游戏，对应playing games。再按照示例结构写出每组对话：
1.
Girl: Are they playing basketball?
Boy: Yes, they are.
2.
Girl: Are they playing ping-pong?
Boy: Yes, they are.
3.
Girl: Are they running?
Boy: Yes, they are.
4.
Girl: Are they doing the high jump?
Boy: Yes, they are.
5.
Girl: Are they playing games?
Boy: Yes, they are.
【答案】示例：
1.
Girl: Are they playing basketball?
Boy: Yes, they are.
2.
Girl: Are they playing ping-pong?
Boy: Yes, they are.
3.
Girl: Are they running?
Boy: Yes, they are.
4.
Girl: Are they doing the high jump?
Boy: Yes, they are.
5.
Girl: Are they playing games?
Boy: Yes, they are.
【知识点】现在进行时、一般疑问句、情景交际
【点评】本题是看图情景对话题，考查学生对现在进行时一般疑问句的运用，要求学生准确识别图片活动并匹配英语表达，是基础的口语交际练习。
【难度系数】0.3