https://reurl.cc/aL0veZ I believe it depends on how it's used, although either usage is fine in modern English. "Fifth grade" is a noncount noun, therefore doesn't require a definite article. "American students study geography in fifth grade." However, noncount nouns, when plural, take the definite article if referring to a defined or specific group. Therefore when a speaker is referring to their specific experience, they may appropriately use the definite article. "I studied geography in the fifth grade." At least that's how I learned it. https://reurl.cc/prny98 -- 【sik-sut蟋蟀；tshiok-tsit促织(文)；gim5-khiong5吟蛩(文): cricket】【too7-kau5 杜猴: Formosan giant cricket 台湾大蟋蟀(华语)】【too7-peh-a2杜伯仔: mole cricket 蝼蛄(华语)】【tsiong-su螽斯: katydid, bush cricket】【oo-liong5乌龙: black katydid 黑色的螽斯(华语)】 --

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