【題目】The girl could dance three years ago. (改為否定句)
The girl three years ago.

【答案】couldn't;dance
【解析】①句意:三年前這個女孩不會跳舞.肯定句改為否定句,先找be動詞,再找情態(tài)動詞,本句中有could,故只要在could后面加not.could not=couldn't.所以答案是couldn't.
②句意:三年前這個女孩不會跳舞.情態(tài)動詞+動詞原形.所以答案是dance.

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