**they do not play an unimportant role in our life(make it affirmative)
**they bear a great impact on the climate(make it exclamatory)
**we use then for various purposes(make it passive)
**but,we are cutting down tress randomly ( make it passive)
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they plays an important role in our life.
it is used 10 for various purposes by us.
but trees are randomly being cut down by us
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