两者根本搭不上边,是两个意思
it will be 它将是...如,it will be a fine day tomorrow ,这里it只天气,意思是明天将会是个好天气
there will be,是there be 句型变来的,意思“有”
there will be,是将会有,There will be a party in our school.我们学校将会有一场party