안녕하세요!
I think it's better to see with some sentences so I made some example sentences.
These two sentences are with Verbs
1. 오다
비가 오는 것 같아요 seems /looks like it's raining
비가 올 거예요 It will rain / it's going to rain
2. 공부하다
그 여자가 공부 하는 것 같아요 seems/ looks like she's studying
그 여자가 공부 할 거예요 she will stuy/ she's going to study
And these sentences are with ADJs.
And you can see when it's connected to adjs, sometimes it can be strong guessing :)
3.
한국은 날씨가 좋은 것 같아요 seems/looks like a good weather in Korea
한국은 날씨가 좋을 거예요 it will be/it's going to be a good weather / must be good weather in Korea
4.
그 사람이 바쁜 것 같아요 he seems / he looks busy
그 사람이 바쁠 거예요 he will be/ is going to be/ must be busy