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For some time past it had been widely accepted that babies—and other creatures—learn to do things...

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will be pulled  had been pulled  have been pulled  are pulling  
am free    will be free    have had time    had time  
had to be    should be    would be    would have been  
Some cultures favor the past time.  Some cultures have the tendency to favor the present time.  Some cultures tend to favor the future time.  All of the above.  
change    are changing    have changed    had changed  
it supported life in the past  certain gases are used to cool the planet  the atmosphere can be heated enough to grow simple plants  the planet’s volcanoes become as active as they were in the past  
Some cultures favor the past time.  Some cultures have the tendency to favor the present time.  Some cultures tend to favor the future time.  All of the above.  
have    had    would had    had had  
have    had    would had    had had  
it supported life in the past  certain gases are used to cool the planet  the atmosphere can be heated enough to grow simple plants  the planet’s volcanoes become as active as they were in the past  
had a rest    spent    had some nice food    enjoyed themselves  
you and I  have had  on  might be  
am free  will be free  have had time  had time  
had a rest    spent    had some nice food    enjoyed themselves  
have caused    caused    had caused    has caused  
will be pulled    had been pulled    have been pulled    are pulling  

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