在英语学习过程中，现在进行时是一个非常基础且重要的语法点。它用于描述当前正在发生的动作或正在进行的状态。掌握好现在进行时的结构和用法，对于提高英语表达能力有着重要作用。以下是一些关于现在进行时的练习题及参考答案，帮助你更好地理解和运用这一语法结构。
一、选择题
1. — What are you doing now?
— I ______ a book.
A. read
B. am reading
C. reads
D. is reading
2. The children ______ in the garden.
A. play
B. are playing
C. plays
D. is playing
3. She ______ her homework at this moment.
A. do
B. does
C. is doing
D. are doing
4. We ______ for the bus when it started to rain.
A. wait
B. are waiting
C. were waiting
D. was waiting
5. Look! The cat ______ on the table.
A. is sitting
B. sits
C. sit
D. are sitting
二、填空题
1. They ______ (play) football now.
2. My sister ______ (do) her homework at the moment.
3. The teacher ______ (explain) the lesson carefully.
4. We ______ (watch) a movie when the phone rang.
5. He ______ (write) a letter to his friend.
三、改写句子（将一般现在时改为现在进行时）
1. She reads books every day.
→ She ______ books now.
2. They go to school by bus.
→ They ______ to school by bus now.
3. He eats lunch at 12 o'clock.
→ He ______ lunch now.
4. We study English in the morning.
→ We ______ English now.
5. The dog barks loudly.
→ The dog ______ loudly now.
四、翻译练习
1. 他正在做数学作业。
→ He ______ math homework.
2. 我们正在听音乐。
→ We ______ music.
3. 她在给朋友写信。
→ She ______ a letter to her friend.
4. 孩子们正在操场上玩耍。
→ The children ______ on the playground.
5. 那个男孩正在踢足球。
→ The boy ______ football.
五、简答题
1. 现在进行时的基本结构是什么？
2. 举出三个使用现在进行时的常见场景。
3. 如何判断一个句子应该使用现在进行时而不是一般现在时？
参考答案
一、选择题
1. B
2. B
3. C
4. C
5. A
二、填空题
1. are playing
2. is doing
3. is explaining
4. were watching
5. is writing
三、改写句子
1. is reading
2. are going
3. is eating
4. are studying
5. is barking
四、翻译练习
1. is doing
2. are listening
3. is writing
4. are playing
5. is kicking
五、简答题（参考答案）
1. 现在进行时的结构是：be动词（am/is/are） + 动词ing形式。
2. 常见场景包括：说话时正在发生的事情、特定时间点正在进行的动作、临时性或暂时性的行为。
3. 例如：“I am eating dinner”（我现在正在吃饭） vs “I eat dinner at 7 p.m.”（我每天七点吃晚饭）。
通过以上练习，相信你对现在进行时的理解会更加深入。建议多做类似的题目，并结合实际语境进行练习，以达到熟练掌握的目的。
