Ｑ１）　友達？ Ａ１）　うん、友達。 (female) Why in this question the answer isnt うん、友達「だ」？ --> As Kinzo-san answered to you, 友達だ sounds a bit rough in colloquial though it's correct grammatically. We usually say うん、友達だよ. Ｑ４）　そう？ (Is that so?) Ａ４）　うん、そうだ。 (male) Since here we use だ --> The same happens in this case, うん、そうだよ sounds friendly and generally we say so. --------------------- 大人だった why do we use the smaller つ over here? so when during pronunciation its datta? Does っ represent an extra t? --> The small っ and つ should be distinguished in Japanese, of course the pronunciations are different. here is what I know of the mini hiragana: pronunciation of "じや" is "ji-ya", while "じゃ" is "ja". --> じや and じゃ are different. (じや=jiya, じゃ=ja) --------------- 1) 静か「な」人 2) きれい「な」ひと 3) みこさんはよい「な」ひと With the logic of 1 & 2, why can't I use 「な」inside? --> しずかな and きれいな are な-adjectives and よい is い-adjective, so よいなひと isn't correct. Good questions! I hope this helps you.

＞Ａ１）　うん、友達。 (female) 女性が、「うん、友達だ。」と言うと、少しぶっきらぼうな印象になります。(It sound like brusque.) 「うん、友達だよ。」と言うとベターです。

ありがとうございます！I have since found out its the double consonant over here http://www.textfugu.com/season-1/reading-writing-memorizing-hiragana/4-8/#top Its quite interesting actually.

The small っis like the double consonant, so だった is "datta" and ちっそ is "chisso", instead the small ゃゅょare differents. Here is the Hiragana Table. I don't know if it helps you. http://lightprince.wordpress.com/2011/06/12/hiragana-table/

ありがとうございます！