kitty was able to dance very well when she was five 改同义句
问题描述：
kitty was able to dance very well when she was five 改同义句
答
kitty could dance very well when she was five
答
kitty could dance very well when she was five.
或
kitty was good at dancing when she was five.
be able to = can
do sth well = be good at
答
kitty was able to dance very well at the age of five.
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答
kitty was able to dance very well when she was at the age of five
答
kitty can dance very well when she was five.
be able to = can