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I have been breathing oxygen for my entire life, ... ?
... haven't I?
(Present Perfect Continuous)
Mary ... out a pond recently, hasn't she?
(clean)
... has cleaned ...
(Present Perfect)
Mark has visited distant wetlands yesterday.
Mark visited distant wetlands yesterday.
(Past Simple)
This company isn't recycling factory waste, ... ?
... is it?
(Present Continuous)
People ... endangered animals in future, will they?
(kill)
... won't kill ...
(Future Simple)
Scientists don't studying formation of acid rains, do they?
Scientists don't study formation of acid rains, do they?
(Present Simple)
Inspectors have already closed the recycling centre, ... ?
... haven't they?
(Present Perfect)
WWF ... solar power for over ten years, hasn't it?
(use)
... has been using ...
(Present Perfect Continuous)
Bear don't live in tropical rainforests, will they?
Bear don't live in tropical rainforests, do they?
(Present Simple)