there (will be) serious air pollution if people use more and

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there (will be) serious air pollution if people use more and more cars.为什么用will be?

条件状语从句,主将从现,从句if people use,用了一般现在时,主句必须用一般将来时,表示将来会有严重的空气污染
另外 there be结构是表示存在有的句式,即哪里有,be可以有时态的变化,一般将来时,be变为将来时的will be

there (will be) serious air pollution if people use more and -if there are()people driving,there will be()are pollution.- There will be more pollution in big and c____city. If there are [ ]people driving, there will be [ ] air pollut there will be more pollution from now will there be more pollution?怎么回答 The air will be fresh and clean if we ____rid of pollution. Now the air pollution in this city ( ) more and more serious Air pollution is more serious than water pollution.的意思? Stop riding in cars,or there will be more and more pollution there will be more and more people 和there will have more and 同义句转换 People will die if there is no air and no water.People