They are antonyms. Pollute and purify are opposite meanings. Pollute means to ruin or make something unclean, while purify means removing the harmful or dirtiness out of something.
Answer:
There are many ways to go about this. The common tense rule is this: The tenses of verbs in a sentence must be consistent when the actions happen at the same time. When dealing with actions that occur at different points in time, however, we can – and probably should – use multiple tenses in the same sentence.
Hope this helps!!
~gloriouspurpose~
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