1.   As the years went by and the excruciating physical pain continued, the woman became understandably more and more depressed and anxious.

2.   As the years went by, he seemed to care less and less about his reputation.

3.   As the years went on and no better idea about how one got polio was advanced, the theory took on importance.

4.   At the time he said never again, but a few years have gone by and he has a different perception.

5.   But as the years went by, it could never scrape together the money to put in a swimming pool.

6.   Even where deep affection remains unaltered, the gap between them often becomes a chasm as years go by.

7.   In Warsaw he had been some sort of real-estate broker, but years had gone by without his having concluded any deals.

8.   They never seem to let a year go by without introducing a new version of their software.

9.   Years went by before he could be persuaded to hire an assistant engineer or draughtsman.

10.   Years of research went into the book.