Sentence examples for this has been known from inspiring English sources

This has been known to happen.

This has been known since 1996.

This has been known since the 1970s.

All of this has been known for some time.

This has been known to happen in the House.

In fact, this has been known for well over a century.

The rate of global warming does fluctuate but this has been known for a long time.

If this had been known, it would have been much more serious".

"If this had been known before, then this definitely would not have been the choice," Mr. Colom said.

The Priory of Sion is a hoax and this had been known for at least 20 years.

Since this date, this province has been known as an active focus of ZCL.