You can use ”家（いえ/ie）”　when you are speaking about a house, but when you speak about your own you can use ”内（うち/uchi）”. Maybe you heard "ie ha(wa)", that is they might be speaking about the house as the main topic.

You say ’’まだ’’(mada). In your example it would be: あなたのへやはまだきたないですか。(Anata no heya ha mada kitanai desu ka).

For example when you speak to someone, depending on age difference, sex, relantionship, etc. you can refer to that person in different ways. "Name+kun" is used when refering to boys. (Used a lot to refer to childs but can also be used between adults but not with strangers). "Name+chan" is usually used to refer to girls. (Used a lot to refer to childs but can also be used between adults but not with strangers). "Name+san" is used to address people of same age or older and actually to refer to anyone. "Name+senpai" Is used to adress people older than yoursel but is generally used by students to refer to their higher grade partners.

"Wa" is used to refer to the main topic but "o" is used to refer to actions, for example: 車は白いです。Kuruma ha(wa) shiroi desu.　(The car is white) あなたは学生です。Anata ha(wa) gakusei desu. (You are a student) 車を買います。Kuruma wo(o) kaimasu. (I will buy a car) 電車をおります。Densha wo(o) orimasu. (I will get off the train)

"Áve" es la familia de animales catalogados como tal, que comprende o abarca a los "pájaros" y otras áves como "gallinas, patos, etc".

You can say: 東京で買い物をしたい！　Toukyou de kaimono wo shitai! 東京へ買いに行きたい！ Toukyou he kai ni ikitai!

They had fun = Se diviertieron They were having fun = Se estaban divirtiendo But "Se divertían" can be used in two ways. You can use it to explain that some people was having fun at some point in the past (you can add that they don´t have fun any more). So it´s not a direct translation to "They used to have fun" to which, "Solían divertirse" is a more exact translation. The difference between those two is that "Se divertían" can be used as Josep said as a parallel action to another one and in other cases. "Solían divertirse" is used to express that they were "accustomed" to doing that. So one can imply the continuation of an action over an extended period of time "Solían divertirse" while the other can´t "Se divertían" which can span a moment in time.

Also, you can use "mi" together with "me" for such cases when you want to give more importance to the subject towards whom the action was taken, for example: "Me escribió una carta a mí" "He/she wrote a letter to me (indeed)" "Me lo dió a mí" "He/she gave it to me (indeed)" It is kind of redundant because when you say "me" you already are telling others to whom you are referring, but, when you add "mi" you are giving more importance to the subject than to the action itself.