never coming back跟never come back有什么差别

Question

never coming back跟never come back有什么差别

Answer 1

never coming back 是分词结构，在句子里可以是谓语的一部分，也可以做“伴随状语”：
They will be never coming back to the earth.
The moon vehicle has been working well hundreds of miles away from the earth, never coming back to us, ever.

never come back 是谓语动词形式：They will never come back to the earth.
如果写成 never-come-back，可用作形容词：The moon vehicle is a never-come-back tool for the moon exploration project。

never coming back 和 never come back 词义上一致。