eg.
A strange dream upset Jane. ===>
That she became a snake upset Jane.
That she became a snake is shocking.
That she became a snake is just a rumor.
That she became a snake proved that Jane was a bad girl.
The truth is still unknown. ===>
What happened at the hotel is still unknown.
A man is not important. ===>
Who broke the glasses, is not important.
What broke the glasses, is not important.
Where the taxi hit the bus, is not important.
Why the taxi driver hit the bus is not important.
For who the taxi driver hit the bus is not important.
Whether the taxi driver hit the bus or not , is not important.
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