could you swim when you were eight years old 为什么这里的were不用原型,could不是情态动词吗?

swim when you are -Could you swim when you were seven?-___,___ ___.And I swam very well. could you swim when you were eight years old 为什么这里的were不用原型,could不是情态动词吗? Could you swim when you were ten?No,I can't./Yes,I can./Yes,I could.哪个对为什么 同义句转换 I could swim when I was 10 years old.I could swim----- ------10.I could swim-----10---- ------. could she swim when she was fou作否定回答 i could swim when i was twewe(同上） He could swim when he was five,and l could swim,too.（使两句意思基本一致）He could swim when he was five.( ) ( ) ( ) When he was five years old ,he could swim ( )( )( )( )( )five,he( )( )( )swim同义句转换 i could swim when i was six years old为什么用swimi could swim when i was six years old为什么用swim而不是swimming Li Fang could swim when she was six years old.【改为同义句】 LiFang could swim at the------ ------six. I could swim when I was 5 years old .同义句：I could swim ___ ___ ___ ___5. 改为同义句When I was a boy,I could swim very well. ------ ------ ----- ,I could swim very well. 英语翻译Can you to 　　a　　horse　　within　　five　minutes．　　His cousin could swim when she was four years old　意思相同的句子 i could swim when was 10 years old 同义句 I ____ _____ swim ____ _____ _____ _____ 10. Could you tell me when (start) tomrrow When I miss you .I could not kate could swim when she was four years old.同义句