were supposed to
definitions
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used to express that something was expected or planned to happen in the past (plural or formal 'you')zh: 用于表达过去某事被期望或计划发生(复数或正式“你”)
examples
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They were supposed to arrive at 8 PM, but they're late.
他们本应该晚上8点到达,但他们迟到了。