‘-을/ㄹ 것 같다’ is placed after a verb or adjective word stem and is used to show the speaker’s vague guess being made concerning the future. When the word stem ends with a consonant, use ‘-을 것 같다’. When it ends with a vowel or a consonant ‘ㄹ’, use ‘-ㄹ 것 같다’.
● 이번 시험은 어려울 것 같아요. (I think this text will be hard.)
● 그 사람은 안 올 것 같아요. (I think he will not come.)