Impersonal reporting
When it is not important who said it or when it is a commonly
held belief or idea, we can use passive reporting verbs like say,
believe, know, think, consider, claim, expect, suppose,
report, etc with the structure:
It + passive reporting verb + that
People thought she had paid too much.
It was thought that she had paid too much.
People have reported there was a bomb on the plane.
It has been reported that there was a bomb on the plane.
People know high levels of radiation may cause cancer.
It is known that high levels of radiation may cause cancer.
