Key Info

Question 1

Turn verbs and adjectives ending in 하다 to nouns by…?

Answer 1

Removing 하다

Question 2

adding ~ㄹ/~을 to a stem of a verb or adjective does what?

Answer 2

adding ~ㄹ/~을 to a stem of a verb or adjective turns it into a word that can describe a noun in the future

Question 3

Conjugating Verbs/Adjectives USING 이다 Future tense end of sentence.

Answer 3

Now, to end the sentence, you need to add 이다 to the noun:

나는 좋은 사람이다 = I am a good person.

So, again, when Korean people conjugate verbs/adjectives to the future, they usually do so by adding ~ㄹ/~을 to the word stem:

나는 행복할
나는 먹을
나는 공부할

But this changes verbs/adjectives into an adjectives that describe nouns. Therefore, (just like 좋은) a noun must follow these words. The noun that is always used in this situation is 것 (thing):

나는 행복할 것
나는 먹을 것
나는 공부할 것

Now, to end those sentences, you need to add 이다 to the noun:

나는 행복할 것이다
나는 먹을 것이다
나는 공부할 것이다

If you try to directly translate these sentences to English, they have the meaning:

I am a thing who will be happy
I am a thing who will eat
I am a thing who will study

But their actual meanings are:

나는 행복할 것이다 = I will be happy
나는 먹을 것이다 = I will eat
나는 공부할 것이다 = I will study

The 이다 can then be conjugated based on the level of politeness or formality. But keep in mind that even though this sentence is conjugated into the future, the 이다 should stay in the present tense. Because the ~ㄹ/을 creates a future sentence, 이다 does not need to be in the future.

것 is also sometimes shortened to 거, for no other reason than it is easier to say and creates a shorter sentence. For example, these two are exactly the same:

저는 밥을 먹을 것이에요 = I will eat rice
저는 밥을 먹을 거예요 = I will eat rice