Thank you for checking my question.
I’ve been cooped up playing a video game for some time (in the corona situation). There are a lot of quests (missions) in it. In one of them, I have to offer up four flowers at each altar on four places.
I wandered from place to place in the stage I needed to go to, and offered up three of four. Then finally I found the forth alter. Once I offered up the last flower on it, the character I was controlling said, “That’s the flowers placed in all four locations.”
I got a question here. Why is it “That’s” and not “Those are”? Because “flowers” is plural. What does “That” mean in this situation? Or, is a fixed expression "that is to say" abbreviated "that's" here?
It's a way of saying that the mission has been accomplished. It's like the "that" in "that's all" or "that does it". Its referent is the whole phrase "the flowers placed in all four locations" as a task.
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It's a way of saying that the mission has been accomplished. It's like the "that" in "that's all" or "that does it". Its referent is the whole phrase "the flowers placed in all four locations" as a task. It is a colloquial construction that is not very common.
LittleshiroThat’s the flowers placed in all four locations.
~
That's [ [the task] [ of placing the flowers in all four locations ]
[ done. ] ]
CJ