1. I сould/ was able to finish my homework before 7 pm yesterday.
2. My son was able to talk when he was only 18 months old.
3. -Could (you) play piano before you came to our music school? - I couldn*t play very well.
4. We could not get ready for the performance in spite of the lack of time.
5. When my sister was only five years old, she could swim very well. One day she was able to swim across our river.