there must be no life on the earth这句话怎么理解,用了什么结构,详解.

there must be no life on the earth这句话怎么理解,用了什么结构,详解. 类似 there is no people in the earth 什么情况下必须用there be 结构?、 without water,there must be no lift on the earth的意思 __water___air,there can be no life on Earth. Without air,()no life on the earth If there(be)__________ no oxygen on earth,life as we know it There is no life on the Earth _____(with) the Sun. sometimes life in the end there must be,no life in it up. There will be no water or air on the earth 的同义句 There will be no space to live_the earth in the future A.on all life on the earth depends on the sun 这句话 为什么是depends 而不是 There ______ no life on the moon.