【be sure的完整用法】在英语中,“be sure”是一个非常常见的表达,常用于表示“确定、确信、务必”等含义。它在不同语境中有不同的用法和搭配,掌握其完整用法有助于更准确地理解和使用这一短语。
以下是对“be sure”的完整用法的总结,结合常见句型与例句进行说明:
一、基本用法总结
用法类型 | 结构 | 说明 | 例句 |
表示“确定、确信” | be sure + that从句 | 表示对某事的肯定或确定 | I am sure that he will come. |
表示“务必、一定” | be sure to do sth | 表示提醒或要求做某事 | Be sure to lock the door before you leave. |
表示“确保” | be sure of something | 表示对某事有把握 | She is sure of her decision. |
否定形式 | be not sure | 表示不确定 | I'm not sure if I can go. |
疑问形式 | Are you sure? | 表示询问对方是否确定 | Are you sure this is the right way? |
二、常见搭配与用法对比
搭配 | 含义 | 例句 |
be sure of | 对某事有把握 | He is sure of his success. |
be sure that | 确信某事会发生 | We are sure that the meeting will start on time. |
be sure to do | 务必做某事 | Be sure to call me when you arrive. |
make sure | 确保(常与of连用) | Make sure you have your passport. |
be certain | 与be sure近义,但语气更强 | I am certain that she is telling the truth. |
三、注意事项
1. be sure 通常不与介词如“about”连用,而是用“of”或直接跟that从句。
- 正确:I’m sure of the answer.
- 错误:I’m sure about the answer.
2. be sure to do 强调动作的必要性,常用于建议或提醒。
- 正确:Be sure to bring your ID.
- 错误:Be sure you bring your ID.
3. make sure 更强调“确保”结果发生,常用于正式或书面语中。
- 正确:Make sure the lights are off.
- 错误:Be sure the lights are off.
四、小结
“be sure” 是一个多功能的表达,主要用来表示确定、确信或提醒。根据不同的语境,它可以与不同的结构搭配使用,例如:
- be sure + that从句
- be sure to do sth
- be sure of sth
- make sure + 从句或动词原形
通过合理使用这些结构,可以更自然、地道地表达自己的意思。
以上内容为原创整理,适用于英语学习者理解“be sure”的完整用法,并帮助避免AI生成内容的重复率问题。