It be going to rain tomorrow这句话哪里错了,该怎么改?

It's going to rain =it will be rainy it is going to rain和it is going to be rainy有何不同 What is the weather like tommow?It [ ] tomorrow.will rain ,is going to be rain ,is to be a rain what is the weather going to be?it's________A raining B rained C going to rain It's going to rain和 It'll be rainingIt'll be raining错哪了 Look at those clouds!It( )rain.A.was going to B.is going to C.be going to It must be going to rain tomorrow,isn't it?还是 won't it Look at these black clouds ._____.A.It will rain B.It's going to rain C.It will be raining D.It is to rain,为什么? look at these dark clouds._______.a.it`ll rain b.it`s going to rainc.it`ll be rain d.it is to rain it's going to rain.=it will rain. it must rain 与 it is going to rain 区别 be go rain it to it seems as if it is going to rain中的be going to 可以换成will吗?为什么答案只能是选择be going to It (is going to/will) rain. It's going to (raining,rain) it s going to rain,____ ____? _____(恐怕)it is going to rain It’s going to （ ）（rain）