be to (EN)

词组

词组 “be to”

1. 表示某事计划或预期将在未来发生。
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   The new museum is to open in the spring.
2. 表示指示或命令
   All students are to remain seated until the bell rings.
3. 表示某事必须发生才能使另一件事成为可能。
   If she is to succeed, she must practice every day.