英语中的现在进行时主要用于描述当前正在进行的动作或存在的状态。它由“be动词（am/is/are）+ 动词-ing形式”构成。为了帮助大家更好地掌握这一语法点，以下是一些精心设计的练习题，通过实际运用加深理解。
一、单项选择题
1. Look! The children ________ (play) in the park.
A. play
B. is playing
C. are playing
2. She ________ (read) a book under the tree right now.
A. reads
B. is reading
C. read
3. Listen! Someone ________ (sing) in the next room.
A. sings
B. is singing
C. sang
4. My father ________ (work) on his computer at this moment.
A. works
B. is working
C. worked
5. They ________ (watch) TV while I am writing.
A. watch
B. are watching
C. watched
二、填空题
6. Look! It ________ (rain). Please take an umbrella.
7. What ________ your brother ________ (do)? He ________ (swim) in the pool.
8. The teacher ________ (explain) the lesson to the students carefully.
9. Be quiet! The baby ________ (sleep).
10. My mother ________ (cook) dinner for us now.
三、改写句子
11. Tom writes a letter every day. （改为现在进行时）
→ Tom ________ ________ a letter now.
12. We often go hiking on weekends. （改为现在进行时）
→ We ________ ________ hiking now.
13. She listens to music every evening. （改为现在进行时）
→ She ________ ________ to music now.
14. They finish their homework before 9 PM. （改为现在进行时）
→ They ________ ________ their homework now.
15. I make breakfast for my family every morning. （改为现在进行时）
→ I ________ ________ breakfast for my family now.
四、情景对话
假设你正在公园里散步，看到以下场景，请根据实际情况补全对话：
A: What are you doing?
B: I'm __________ (walk) in the park.
A: Oh, it looks nice. Who are you with?
B: I'm __________ (meet) some friends here.
A: That sounds fun!
通过以上练习题，希望大家能够更加熟练地使用现在进行时，并能在日常交流中灵活应用。如果还有疑问，可以随时查阅相关资料或向老师请教！
