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Level 20

'It + be + past participle' clauses


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It has been pointed out that
The scientists have pointed out that...
it was observed that
I observed that...
It is shown that
They show that
It was proven that
He proved that
it has been demonstrated that
The research has demonstrated that
It is thought that
They think that
It is believed that
He believes that
it has been reported that
The scientists have reported