在学习英语的过程中，掌握各种时态是非常重要的。今天，我们就来聚焦于一个常见的时态——现在进行时。现在进行时主要用于描述当前正在进行的动作或正在发生的事情。它的结构是由“be动词（am/is/are）+ 动词-ing形式”构成的。

接下来，让我们通过一些练习题来巩固一下这个知识点：

练习题一：选择正确的选项

1. She _______ (read) a book right now.

A. reads

B. is reading

C. read

正确答案是：B. is reading

2. They _______ (watch) TV at the moment.

A. watch

B. are watching

C. watched

正确答案是：B. are watching

3. I _______ (listen) to music while you were talking.

A. am listening

B. was listening

C. listen

正确答案是：B. was listening

练习题二：改写句子

4. He plays basketball every day.

改写为现在进行时：He _______ (play) basketball now.

答案：is playing

5. The students write letters to their parents.

改写为现在进行时：The students _______ (write) letters to their parents.

答案：are writing

练习题三：填空

6. Look! The cat _______ (sleep) on the sofa.

答案：is sleeping

7. Listen! Someone _______ (sing) in the next room.

答案：is singing

通过以上练习题，我们可以看到现在进行时的重点在于强调动作正在进行中。希望这些题目能帮助大家更好地理解和运用现在进行时。继续努力，英语学习会越来越轻松！