They are actually the same. Literally different : 我渴了. = I'm thirsty. 我口渴了. = My mouth is thirsty. (but we don't say this in English)

"I'm on the bus right now" = 我在公共汽车上 This is ok. There's no need to use two 在. Look below : 我 (I am) 正 (now) 在 (on) 公共汽车 (the bus) 上. "上" here is used to describe where you are, but won't show in English. So it is "在......上" EX 在飛機上、在車上、在火車上 BTW, "正在" and "正" both means now, depends on the situation.

雖然義大利語比英文容易學，你還是得花功夫學習。 what wait?! Italian is easier?!

In Taiwan 起士 = 起司 > 乳酪>>>>>> 奶酪>>>>>>>>>>>>>>>>>>> 芝士 = 乾酪 We use 奶酪 as milk pudding here. Barely think as cheese.

I think they are the same in spoken language. "再" here has no meaning of "again". However they can be used in different situations. "吃完飯再來談" I'll say this before or during eating. To me, it means "I already know we should talk later". "吃完飯才來談" I'll say this after the conversation. To describe when we talk. Or as an outsider. Hope it helps.

I feel odd because 男朋友 must not be "朋友", in my own opinion. 男朋友=boyfriend=lover =/= friend , to me. . Anyway let's get back to your question. I try to translate it word by word. . 1. Boyfriend is the one who thinks that making you cry and cheer you up later would be funny. "make you cry" here means no bad will. Just for fun. Like making fun of his girl. EX Boy said to his girl "You are fat." Girl cries. Boy said "Oh I'm just kidding. I love you." Something like that. . 2.Boyfriend is the one drooling over Jessica Alba, but still tells you "Jessica is nothing compared to you". I translation might be weird. Hope you understand. ;)

和你聊天真開心，bye bye

1. 靠 2. 我的天啊 or just 天啊 3. 該死的 、天殺的，"damn" has a feeling of "curse" I think.