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after before當連接詞和介係詞時怎麼判斷,可以舉例說明嗎,喜歡

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before/after 若為介係詞 + Ving
before/after 若為連接詞 + 子句
e.g.1 He brushed his teeth before he went to bed.(此句before為連接詞)
e.g.2 He brushed his teeth before going to bed.(此句before為介係詞)
所以~before/after介係詞 連接詞 可以互換 但前提是2句ㄉ主詞要是同個人/事/物

榕思

e.g.3 Mary played the piano after her mother came home.(此句after為連接詞)
*此句after無法代換成介係詞*
"before/after 若為連接詞 則 主詞不1定相同
"before/after 若為介係詞 則 主詞1定相同

黑子

謝謝妳喔,講的很清楚

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