An instance occurred a short time ago, when I certainly gave up one of the best dogs for lost.

It is because those instances did not occur at the same time.

Most instances of cancer occur among children between 3 to 3.5 years old.

The first instance occurs with the man in the telephone box.

You would struggle to read many books where instances like this occur.

An instance occurs in the first sentence of this section.

The two recorded instances of this occurred in 1961 and 1988.

So far, the most striking instance has occurred in Germany.

The first instance most commonly occurs when a group of students complete training at the same time.

However, with little evidence of such events, it is unknown if these instances actually occurred.