The results are not expected to be known for several years.

You act as if we've known each other for years.

But they had told him what he'd wanted to know for years.

In many cases, they have known one another for years.

She said she'd known him for years and very often they'd go out together.

The office director, a woman he had known for years, would not give a reason.

They must have known for years, perhaps from the very beginning of the program.

They were about the same age and had known each other for 15 years.

The couple by then had known each other for more than five years.

I will have known her for 20 years next month.