他很快就会回来的 He will be back soon He will be back quickly .都可以吗

他很快就会回来的 He will be back soon He will be back quickly .都可以吗 how soon will he be back对吗 I think he will be back soon的同义句 i ll be back和i will be back 我会回来的 用这2个是不是都可以 l think he will be back soon.为什么不能写成 l think he will back so im sure he will be back [ ] [ safe] soon he will be back tomorrow中的be He will arrive soon He will be arriving soon 都可以吗. i will be back soon He will be back after two hours He will be back in two hours. He will be back in four days