KGYSAK: ~것 같다

Something seems to be like something. When you feel the urge to be less than specific about what you're talking about, seems like you should use this guy. However, the grammatical rules for affixing him at the end of the verb aren't especially difficult but are a bit long. Keep in mind that the tense of the sentence will be expressed at the end and that 것 is also commonly spelled (and pronounced) like 거. Also, the 아 often sounds like 애 in common speech. So, in effect, you might spell "it seems like it will rain" any number of different ways:

비가 올 것 같아요 (grammatically correct and most common spelling)
비가 올 거 같아요 (also common)
비가 올 것 같애요 (maybe only used as a text message)
비가 올 거 같애요 (least common spelling but most commonly pronounced)

More rules:

은/ㄴ 것 같다 = descriptive verb ending in a vowel or consonant
는 것 같다 = action verb
을/ㄹ 것 같다 = future tense

More Examples:

좋을 것 같아요
Seems he'll like it.

버스가 늦게 올 것 같아.
The bus seems to be running late.

직원들이 바쁜 것 같아.
The employees seem busy.

그가 실수로 그런 것 같아요.
I guess he did it by mistake.

경기가 곧 끝날 것 같아요.
It seems the game will end soon.

할 수 있을 것 같아요.
I think I can do it.

토 할 것 같애.

I think I'm gunna barf.