To think
This expression is used when supposing that something happened in the past or when supposing the occurrence of an action or situation that has yet to occur. It corresponds to 'looks/sounds like' or 'appears that' in English. For present tense adjectives and past tense verbs, -(으)ㄴ is added to the stem, for present tense verbs, -는 is added, and for future tense verbs, -(으)ㄹ is added.
It is also used to express the speaker's opinion or thought about something indirectly in a polite, non-assertive, and gentle manner.
-(으)ㄴ 것 같다 is a more direct expression and thus is used when the speaker has a clear and definite basis for the supposition. -(으)ㄹ 것 같다, on the other hand, is more indirect and therefore is used when making a vague supposition.
(Supposition made after either seeing others experience the hot weather or after experiencing the heat directly.)
(Vague supposition made on the basis that yesterday was hot, so therefore today will likely be hot as well.)
Comparison:
Used to express a thought, guess, or assumption that one isn't fully certain of.
(으)ㄹ 것 같다 signifies future tense.
았을/었을/했을 것 같다 signifies a guess about a possible outcome or a past event that might have occurred.
Check out noun modifiers 는/(으)ㄴ/(으)ㄹ and (았/었/였)던 and (았/었/했)을 것 for more info.
In casual or colloquial language, 는 것 같다 is often shortened to 는 거 같다. Spoken language transcribed to text may often be written this way.
Native speakers may colloquially write 는거 or 는것같다 (without the space). It doesn't strictly follow spacing rules, so its a common "mistake". The meaning is the same.
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