It is to rain.is to是啥意思?

It is to rain.is to是啥意思? it must rain 与 it is going to rain 区别 it is going to rain tomorrow是甚么意思 It (is going to/will) rain. _____(恐怕)it is going to rain It is going to _____ (rain). it is _____(cloud)maybe it is going to rain What is the weather like tommow?It [ ] tomorrow.will rain ,is going to be rain ,is to be a rain It seemes that it is going to rain . it looks as if it is going to rain It s-e- as if it is going to rain is about to rain、 is going to rain 、 is raining 、is to rain有什么区别 it is going to rain和it is going to be rainy有何不同 It___that it is going to rain tomorrowA looksB appearsC seems The weather report says it is going to rain tomorrow. It is going to rain tomorrow.(改为一般疑问句) 连词成句.going,is,it,to,tomorrow,rain ( ) It is going to rain.（改为否定句）