~(으)리라(고) =  Will probably be/do, I bet/I reckon that … is likely the case. 

(Non-final, quoted prospective assertive.  Often used to quote internal thoughts. A fancy equivalent to -(으)ㄹ 것이라(고), and in origin the quoted version of -(으)리다)

도망가리라고 생각했었기 때문에 = Because he had thought [at first] that he would run away…
살금살금 움직이리라고 마음먹고 = He made up his mind to move quietly, and…
스위치 있는 쪽으로 가리라고 결심했다 = He decided to go toward the switch.
이것으로서 족하리라고 생각되었다 = With this, he thought it would be sufficient.
당장 떠나리라 마음 먹었다 = I made up my mind to take off immediately.
집을 다시 지으리라 생각했다 = He thought that he might rebuild his home.
서울에 내리면 아침이 되리라 했다 = When I disembark in Seoul, it will be morning, she thought to herself.
잘 지내시리라 믿습니다 = I am sure you are doing great.
그 사실을 아는 사람이 많지 않으리라 생각합니다 = I think few people know that.
알아서 잘하리라 믿어 = I trust you’ll take care of it.   
그가 잘하리라고 생각해 = I expect he will do well. 

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Verbs into adjectives (noun groups)

제가 보는 책이에요 = It’s a book that I’m reading
제가 본 책이에요 = It’s a book that I’ve read
제가 볼 책이에요 = It’s a book that I will read

요즘 공부하는 외국어예요 = It’s a foreign language that I am studying these days.
어제 공부한 외국어예요 = It’s a foreign language that I studied yesterday.
내일 공부할 외국어예요 = It’s a foreign language that I will study tomorrow

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verb ~(으)ㄹ + noun = future tense

읽을 책 = a book that (someone) will read, a book to read
초대할 사람 = a person that (someone) will invite, a person to invite
보낼 편지 = a letter that (someone) will send, a letter to send

먹을 것 = something to eat (food)
탈 것 = something to ride (vehicles)

마실 것 = something to drink (beverages)

내일 할 일이 많아요 = tomorrow there is a lot of work for me to do
지금은 할 이야기가 없어요 = Right now, I have nothing to say
냉장고에 먹을 것이 전혀 없어요 = In the refrigerator, there isn’t anything to eat at all

~(으)ㄹ 것  이에요 = ~(으)ㄹ 것이에요 = ~(으)ㄹ 거예요 (it is a thing to do.)

이거 누가 먹을 거예요? = Who will eat this? (This thing, it is something that WHO will eat?)

~(으)ㄴ + noun – past tense

어제 본 영화 = the movie that I saw yesterday
어제 온 사람들 = the people who came here yesterday
친구가 말한 카페 = the cafe that a friend talked about