In a sense, we have had an experiment going for the last 40 years.

Very few people are going to ask you how the experiment went.

We don't know because the experiment hasn't gone on that long.

This happened to be a time when a new experiment was going on.

This experiment has been going on here for a long time.

Here, at least, the experiment did not go so well.

London was not the only place where such experiments were going on.

The cells were growing, but he did not believe the experiment was going right.

With children in the picture, parents said, the experiment should go elsewhere.

Thank God we don't have any experiments going on with elephants.