改同义句：
问题描述：
改同义句：
I could tell many stories when I was 4 years old.
I______ ______ ______ tell many stories when I was 4 years old.
答
was able to
can 和 be able to 都表示有能力做某事,属于同义词.不过be able to 时态的变化比较多一些.