1.Many years later, the doctor became old. He began to forget thing.
多年以后，医生老了，忘性也变差了。
2.He is not perfect, some times he may got his mind short cycled, sometimes he forget thing. Fortunately it does not happen often.
但他并不是一个完美的人，他有些时候会脑子短路，有时会丢三落四的，幸好他这个毛病不是经常发作的。