Well, this is a long compound sentence, so you need to put commas! Both that and which are correct, however, if you put "which" you should put a comma after it because it is a long sentence, while "that" you use don't need to ^^ If you wanna learn more about Grammar and punctuation, read : The Blue Book of Grammar and Punctuation ^-^ I will explain for you why which is preferable in your case: "Which" is used in writing English more than "that", plus it used often in texts (narrative, descriptive, argumentative...) while "that" is more preferable when you are reporting a speech.

Thank you Ciao DosAnjos ^^ Thanks a lot Heesob! That was very useful just like the last time ^___^

This is not by me! It is a friend's answer which helped me to get it an easy way : 아직 mainly means 'yet'. I'm not ready yet. 나는 아직 준비가 안됐어요. 아직도 mainly means 'still' but can be used as 'yet' and it has a bit emphsis. "It's still raining." "아직도 비가 와요." "I'm not ready yet." "나는 아직 준비가 안됐어요." This is a normal statement, it only conveys the information that the speaker is not ready. There is no implication. "나는 아직도 준비가 안됐어요." This sentence, whereas, tells the situation depending on the context. So it can emphsize the situation that the speaker is not ready. Let me give you an instance. "Have you dicided?" 결정했어요? "No, I don't know." 아니, 모르겠어요 "Why are you so indecisive?" 왜 그렇게 결정을 못해요? "I don't know. I'm not ready yet." 모르겠어요, 아직도 준비가 안됐어요. Another instance. "It's raining." "비오네요." "still?" "아직도요?" -------------------------------------- 저는 아직도 너무 지루해요(sounds natural) 저는 아직 너무 지루해요.(sounds awkward) 아직도 -(has an ehmpasis) still, yet 아직 - yet This is very hard to explain because it's about the nuance. I think it takes time to understand. Hope I could help a little. ^^

Hello Mr. Steve,

Thank you very much for your usuful and outstanding explanation.

Now, I can understand the rules to form a meaningful sentence without Gramatical mistakes ^^

I am really grateful for your help as well as for Soymylk comment above.

Cheers