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have; is being taken have; has taken 
has; have been taken has; are being taken
would rather have taken would rather not take must have taken can’t have taken
has tried has been tried have taken have been taken
have been taken in has been taken in have taken in has taken in
has taken have taken has been taken have been taken
have; is being taken have; has taken has; have been taken has; are being taken
have taken place have had have been were
has been in has taken part in was in has joined
have been taken place has been taken place have taken place were taken place
life has been improved by technological advance the number of female babies has been declining our species has reached the highest stage of evolution the difference between wealth and poverty is disappearing
took is taking had taken has been taking
have taken place have been taken place took place have taken the place
are seeing; had increased will see；has been increasing see; increased have seen; is increasing
taking to take take taken
was, had taken place was, have taken place has been, had taken place has been, have taken place
had taken is taking takes has been taking
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