as time (goes/went) on, (sentence)

Use the phrase "as time goes on" to talk about something that changes gradually:

As time goes on, our technology becomes more and more complex.

If you're talking about the past, you say "as time went on":

But then as time went on, I started to question some of the things that I had been taught and realize that some of it didn't make sense.

You can also use "as time goes by" in the same way.

This phrase appears in these lessons: