Those were the days.

People often have fond memories of the past. When you're with old friends and talking about good memories from the past, you can express your feeling of nostalgia by saying:

Those were the days.

This means "That was a really great time in our lives."

A similar expression is "the good old days".:

Those were the good old days.

If you want to talk about a period that was difficult or negative, use "tough times":

Those were tough times, weren't they?

This phrase appears in these lessons: