-은/는/을 것 같다 is a grammar pattern for supposition Verb stem+(으)ㄴ : past tense e.g. 먹다 -> 먹은 가다 -> 간 Verb stem+는 : present tense e.g. 먹다 -> 먹는 가다 -> 가는 Verb stem+(으)ㄹ : future tense e.g. 먹다 -> 먹을 가다 -> 갈 Literally, 것(과) 같다 means "It is same thing that" 그는 사과를 먹은 것 같다 It is same thing that he ate an apple. => It seems that he ate an apple. 그는 사과를 먹는 것 같다 It is same thing that he eats an apple. => It seems that he eats an apple. 그는 사과를 먹을 것 같다 It is same thing that he will eat an apple. => It seems that he will eat an apple. Adjective stem+(으)ㄴ : past and present tense e.g. 예쁘다 -> 예쁜 좋다 -> 좋은 Adjective stem+(으)ㄹ : future tense e.g. 예쁘다 -> 예쁠 좋다 -> 좋을 e.g. 오늘 날씨가 좋은 것 같다. It seems that the weather is good today. 내일 날씨가 좋을 것 같다. It seems that the weather will be good tomorrow.