[請益] not just...but合併句子

[purplephoebe (^^)]

題目是
Susan cleaned the house.
Susan helped her brother with the homework.
(用 not just...but...合併句子)

原本我以為答案是
Susan not just cleaned the house but helped her brother with the homework

但正確答案是
Susan did not just clean the house but help her brother with the homework.

想要請問為什麼？謝謝大家:)

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→ peace305:1. 助動詞+否定。2. 連接詞連接二個型態的動詞
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