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.

It's surprising that he can run so fast.

He was able to solve the complex calculation quickly.

He was calculating in his head.

What? I couldn't catch what you said.

Could you bring me that, whatchamacallit?

What do you want to eat?

What, is that my pencil?