be to do的三种常见用法
"be to do" 是一个常见的英语语法结构,通常用于表达计划、安排、义务和命令等含义。它有三种常见的用法:
1. 表示计划或安排:用于表达某事将要发生或计划中的事情。例如:
- The meeting is to be held next Monday.(会议定于下周一举行。)
- The train is to arrive in ten minutes.(火车将在十分钟后到达。)
- We are to leave for Paris tomorrow morning.(我们明天早上要去巴黎。)
2. 表示义务或责任:用于表达某人需要或有义务做某事。例如:
- You are to finish your homework before you go out to play.(你必须在出去玩之前完成你的作业。)
- The soldiers are to protect the civilians at all costs.(士兵们必须不惜一切代价保护平民。)
- The driver is to follow the traffic rules and regulations.(司机必须遵守交通规则和法规。)
3. 表示命令或建议:用于表达某人的命令或建议。例如:
- You are to report to the manager immediately.(你要立即向经理报告。)
- The doctor said I am to take the medicine twice a day.(医生说我要每天服药两次。)
- The teacher suggested that the students are to read more books.(老师建议学生们要多读书。)