客人到的时候，我们会把所有的装饰都布置好。
By the time the guests arrive, we will have set up all the decorations.
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Will英 /wɪl/|美 /wɪl/
set英 /set/|美 /sɛt/
解释
will have set up：将来完成时，表示截止到将来某个时刻已完成的任务
By the time the guests arrive, we will have set up all the decorations.
will have set up：将来完成时，表示截止到将来某个时刻已完成的任务