请将下列句子中的错误改正过来。
It's very nice for you to say so.
A bike runs much more slowly than a motorbike.
The child began to learn to play the piano until he was eleven.
參考答案:It's very nice for you to say so.
改成：
It's very nice of you to say so.
A bike runs much more slowly than a motorbike.
改为：
A bike runs much slowlier than a motorbike.
The child began to learn to play the piano until he was eleven.
该为：
The child did not begin to learn to play the piano until he was eleven.
（这是“not……until……”的句型）
