adjective
Describes the state of something that is anticipated or likely to happen
preposition
Indicates the relationship between 'to' and 'expected' in the phrase
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Given the circumstances, delays in the project were to be expected.
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It's no surprise that the traffic is heavy right now, it was to be expected during rush hour.
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I knew she would be late, that's just par for the course with her. It was to be expected.
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After all the rain we've had, the flooding in the area was to be expected.