be类助动词进行时态的表达与情态动词连用 一、进行时态的表达 在英语中，be类助动词的主要功能之一是构成进行时态，表示动作或状态正在进行中。其基本结构为“be + 动词-ing”，例如： - She is reading a book.（她正在读书。） - They were playing football when I arrived.（我到达时，他们正在踢足球。） 二、被动语态的构成 被动语态是英语中表达被动意义的语态，由be类助动词加上动词的过去分词构成。被动语态的基本结构为“be + 过去分词”，例如： - The window was broken by a stone.（窗户被一块石头打破了。） - The book has been translated into many languages.（这本书已被翻译成多种语言。） 三、情态动词的连用 be类助动词常常与情态动词连用，以表达更加复杂的情感、态度或推测。例如： - He might be working in the office now.（他现在可能正在办公室工作。） - You should be more careful next time.（你下次应该更小心一些。） 新概念英语第三册单词 初中英语单词mp3 新概念英语视频下载 七年级下册英语阅读理解 四、推测与可能性的表示 通过be类助动词与情态动词的结合，可以表达对不同情况的推测和可能性。例如： - There must be someone at home，because the light is on.（家里一定有人，因为灯亮着。） - It could be true，but I'm not sure.（这可能是真的，但我不确定。） 五、构成进行被动语态 当需要表达某动作正在进行且是被动进行时，需要使用进行被动语态，其结构为“be + being + 过去分词”。例如： - The new building is being constructed now.（新大楼现在正在建设中。） - The problem is being discussed by the management.（这个问题正在被管理层讨论。） 六、计划或安排的表示 be类助动词还可用于表达计划或安排好的事情，常常与将来时态连用。例如： - We are going to have a picnic next weekend.（我们打算下周末去野餐。） - The conference is to be held in Beijing next month.（下个月会议将在北京举行。） 七、命令语气的表达 在某些情况下，be类助动词还可以用于表达命令或要求，此时通常出现在祈使句中。例如： - Be quiet，please！（请安静！） - You are to finish the report by Friday.（你必须在星期五之前完成报告。） 通过以上七个方面的介绍，我们可以发现，be类助动词在英语中起着举足轻重的作用，它不仅能够帮助我们表达不同的时态和语态，还能与情态动词连用，表达各种复杂的情感、态度和推测。因此，在学习英语时，我们应该充分理解和掌握be类助动词的用法，以便更准确地表达自己的意思。 一、选择题 1. She _______ in the library when I called her. A. is reading   B. was reading   C. reads   D. read 2. The house _______ by my uncle in 2000. A. built   B. was built   C. is built   D. had built 3. He _______ to the party, but he didn't come. A. was supposed   B. supposed   C. was supposed to be   D. was supposed to have been 4. The book _______ into many languages by now. A. has translated   B. has been translated   C. is translated   D. translated 5. I _______ tired after a long day's work. A. feel   B. am feeling   C. am felt   D. was feeling 二、填空题 1. The project _______ (complete) by the end of this year. 2. She _______ (not understand) the instructions, so she asked for help. 3. We _______ (tell) that the meeting has been postponed until next week. 4. The window _______ (break) by a strong wind last night. 5. They _______ (plan) to visit the Great Wall next summer. 三、改错题 1. The window is broken by a stone. (改为被动语态) 2. He must be working in the office. (改为否定句) 3. She will do the homework tomorrow. (改为被动语态) 4. This book was writing by a famous author. (找出错误并改正) 5. I'm supposed going to the doctor tomorrow. (找出错误并改正) 四、翻译题 1. 这本书正在被翻译成法语。（Translate this sentence into English using the passive voice with a be-verb.） 2. 明天将举行一场重要的会议。（Express this sentence using the future passive voice.） 3. 据说这部电影是根据一个真实故事改编的。（Express this sentence using a be-verb to indicate that something is said to be true.） 4. 当我到达时，他们正在讨论这个问题。（Use a be-verb to express the progressive aspect of the verb "discuss".）