Answer:
They built schools where people learn.
They built hospitals where people get treated.
They spread Islam.
They brought new crop that people eat nowadays.
Explanation:
A plural noun indicates that there is more than one of that noun (while a singular noun indicates that there is just one of the noun). ... Regular plurals follow this rule (and other similar rules), but irregular plurals are, well, not regular and don't follow a “standard” rule.
I believe that the answer to the question asked above is that the expression means you have to carry something before achieving something or going somewhere.
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