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It has been said that the history of {{U}}humanity{{/U}} is one of the survival of the fittest.

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has never gone   had never gone   has never been    had never been  
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is saying  has said  says  has been saying  
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has been open, will close    has opened, closes   opened, will close    has been opened, is closing  
has not decided  are not decided  has not been decided  have not been decided  
is; would have to    has; will have to    has been; will have got to    had been; would have to  
never went  had never been   has never gone  has never been  
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gone, has decorated    been, was decorating    done, decorated    been, has been decorating  
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is; would have to    has; will have to    has been; will have got to    had been; would have to  
have been    has been    will be    were  

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