Man might no longer even exist in present times by the time they were done.

A church probably existed here by 1241, and perhaps earlier.

There is not enough of you to exist by yourself here.

I existed by turns in different places and various states of being.

Until the 1950s, trees used to exist by the square.

Almost all had ceased to exist by the 20th century.

On the other hand, we need to create jobs and, to do this, the conditions must exist for investment by companies.

The problem is that hydrogen does not exist by itself on Earth.

So it's part of an overall strategy, not something that would exist by itself.

This was a short lived group that ceased to exist by 1986.