Lucy and Lily could swim when they were five years old .一般疑问句及肯/否定回答
问题描述：
Lucy and Lily could swim when they were five years old .一般疑问句及肯/否定回答
答
Could Lucy and Lily swim when they were five years old ？
Yes，they could
No，they couldn't
答
Lucy and Lily could swim when they were five years old .
Could Lucy and Lily swim when they were five years old ？ (把情态动词直接提到句首)
Yes，they could
No，they couldn't
答
Could Lucy and Lily swim when they were five years old
Yes,they could
No,they couldn't
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答
一般疑问句：could Lucy and Lily swim when they were five years old?
yes,they could No,they could't