The memories of that summer remain in my heart forever.

I talked about old memories with my schoolmate.

Let's watch a movie together.

We went to see a movie together.

We are working on the project together.

Once upon a time, there was a big castle in this place.

He talked about his travel experiences.

Once, we used to play in the park every day.

In the past, we used to play in the park every day.

He tends to hold onto past failures.