When relaying or asking for information, the following are extremely important for basic question and answer conversation.

누구- who

ex. 누구세요? 

who are you?

뭐- what

ex. 뭐 해?

What are you doing?

언제- when

ex. 언제 가는데?

When are you going?

어디- where

ex. 지금 어디야?

Where are you right now?

왜- why

ex. 너 오늘 왜 이래?

Why are you like this today?

어떻게- how

ex. 오떻게 된거야?

How did this happen? (can also be used to say "what is going on?")

얼마- how much

ex. 이거 얼마에요?

How much is this?

몇- how many

ex. 애들 몇명인데?

How many kids are there?

Bonus word of the chapter:

빌려- to lend

formal command- 빌려주세요.

informal command- 빌려줘.

How to use in a sentence:

subject (the one borrowing the object) + object being borrowed + (optional) 좀 (a little; can be used to make the tone less commanding) + informal/formal command

ex. 나 차 좀 빌려줘. Please lend me the car.

You can add 제발 which means please in a pleading tone.

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