• first conditional
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  • 1. there (be) fewer cars / (be) less air pollution
    If there are fewer cars, there will be less air pollution
  • air pollution (get worse) / trees (be) cut down
    Air pollution will get worse if trees are cut down
  • we (not use) plastic bags / they (not go) into the ocean
    If we don't use plastic bags, they won't go into the ocean
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