It had a red door.
Meaning: This means that the building where people live had an entrance that was colored red.
Choice of Words: It refers to a previously mentioned noun, in this case, house. Had means to possess or own something. Red is a color. Door is an opening in a wall or fence that allows entrance or exit. Together, "It had a red door" describes the house as having an entrance that is colored red.
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Related Expressions