英语口语中类似be careful和be safe这种表达，是什么用法，望高手解答！谢谢

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英语口语中类似be careful和be safe这种表达，是什么用法，望高手详细解答！谢谢~

Be careful to be safe中Be careful是祈使句中的系表结构，to be safe充当Be careful的目的状语。Be careful小心谨慎，be safe保证安全，也就是Be careful小心谨慎的目的是be safe保证安全，整句意思为“小心谨慎保证安全”。Be careful to be safe整句话在仁爱版英语教科书八年级下册中做标题，Be动词得改成动名词形式才能充当标题，所以就变成Being Careful to Be Safe. 整句若改成Being careful is to be safe.，就变成主系表结构而不是祈使句，动名词短语Being careful充当主语，is系动词，to be safe动词不定式做表语，意思就变为“小心谨慎是为了保证安全”。

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【2013北京】五、完形填空（共12分，每小题1分）
阅读下面的短文，掌握其大意，然后从短文后各题所给的A. B. C.D四个选项中，选择最佳选项。
My stutter（口吃）had always been much of a problem. I‟d had so many specialists for my______35______over the years. As l walked down the hallway to meet a new one, memories popped in my head of how painful（痛苦的）being a kid who stutters had been. It______36______hurt.
“Hello! I‟m Mrs. Claussen. I hear you‟re from Texas!”
“Ye-Ye-Ye-Yes m-m-m-m-m-m-m-aam I am…”My heart felt like it was pounding through my chest and my hands were dripping wet. I really blew that ______37______. “Well,” she said with a _____38______smile. I‟ve always liked Texas.”
She turned out to be the best speech specialist I‟ve ever had, not like those who told me to clap my hands while speaking. She was_____39______.She spent the first several weeks just talking to me—asking me all kinds of questions about myself, especially my feelings. And she_____40______ . She then began to teach me about the speech. Not just about my speech, but about everybody‟s.
I______41______ in my old school and was a pretty good tenor（男高音）, but I learned that the new school‟s singing group was all filled up. It was such bad news, for I thought that was the one thing I could really do well - and I could do it_____42______stuttering. Somehow Mrs. Claussen finally got me in the group. I felt like she really cared about me as a person, not just a speech student.
During the next two years, my speech didn‟t get much better - except with her. When I was in college, things got worse. I once even wondered if I would ever be able to_____43_____! It was a very depressing time, and I often felt alone. When I was feeling really sorry for myself, I remembered Mrs. Claussen had told me whether I could______44______ my speech was all up to me. She had told me not to fight for perfect speech, just better speech. She was right about that. I finally improved my speech greatly.
Many years have passed, but I think of her from time to time, wondering if she had as much______45_______on her other students as she had on me. I like to think that she did. Her name was Mrs. Claussen... and she____46____ . I‟II never forget her. 35. A. speech B. study C. dream D. fear 36. A. maybe B. even C. still D. never 37. A. instruction B. description C. introduction D. presentation 38. A. shy B. cold C. weak D. kind 39. A. silent B. simple C. direct D. different 40. A. cried B. listened C. waited D. stopped 41. A. sang B. spoke C. played D. clapped 42. A. against B. besides C. beyond D. without 43. A. practise B. communicate C. report D. reply 44. A. train B. share C. change D. follow 45. A. advice B. influence C. dependence D. action 46. A. continued B. taught C. agreed D. cared
35. A 36. C 37. C 38. D 39. D 40. B 41. A 42. D 43. B 44. C 45. B 46. D

Be careful to be safe中Be careful是祈使句中的系表结构，to be safe充当Be careful的目的状语。Be careful小心谨慎，be safe保证安全，也就是Be careful小心谨慎的目的是be safe保证安全，整句意思为“小心谨慎保证安全”。

Be careful to be safe整句话Be动词得改成动名词形式才能充当标题，所以就变成Being Careful to Be Safe. 整句若改成Being careful is to be safe.，就变成主系表结构而不是祈使句，动名词短语Being careful充当主语，is系动词，to be safe动词不定式做表语，意思就变为“小心谨慎是为了保证安全”。

careful和carefully是一类单词，区别只有一点就是词性不同。

careful是形容词，一般在名词前，be动词后，而carefully是副词。形容词在句中作定语、表语、宾语、补语。副词是一种用来修饰动词、形容词、全句的词、说明时间、地点、程度、方式等概念。副词在句中可作状语,表语,短语。

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英语口语中类似be careful和be safe这种表达，是什么用法，望高手解答！谢谢

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