MORE AND MORE PEOPLE HAVE REALISED WE WON'T HAVE CLEANER WATER TO DRINK UNLE

MORE AND MORE PEOPLE HAVE REALISED WE WON'T HAVE CLEANER WATER TO DRINK UNLE

越来越多的人已经意识到 如果不（unless）······ 我们将没有干净的水可饮用.

越来越多的人已经意识到我们只有...才能有更清洁的水喝

B will be done D is done D 主语将来时 从句一般现在是 越来越多的人已经认识到我们将没有干净的水喝除非某些事不久以后