A friendship had evolved between them over the last few years.

The basic idea did not change but many of the details evolved over the years.

The enemy we face in Iraq has evolved over the past three years.

The much more interesting question is how this will evolve over the next 40 years.

Established in 1994 and it has evolved over the years.

These plans evolved over the next few years, and the project became official in 1972.

"Our campaign has continued to evolve over the years," he said.

Instead, we find the characters having evolved over the last 20 years.

We learned about how individual companies have evolved their food safety programs over the past few years.

In addition students learn how those ideas have evolved over the years.