【題目】They knew how to help her.(改為否定句)

【答案】They didn't know how to help her.
【解析】句意:他們知道怎么幫她。因?yàn)榫渲衚new是過去式,變?yōu)榉穸ň鋾r(shí),需要加助動(dòng)詞did構(gòu)成否定,否定詞為not, did 和not縮寫成didn't。否定句結(jié)構(gòu)是:主語+didn't+動(dòng)詞原形+其他成分。故答案為:They didn't know how to help her.

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