In this case , 可以直接說 :你的成绩比我预期的还差。 要加上去也不會怪 , 把它當成rule . 還要差 , 還要爛 , 還要笨 .....還要難看......可以用在這種句型但是去掉要 , 還是可以並且通順.

真的希望你幸福 , 真希望妳幸福兩句都可以 , 但是語氣不一樣. Both ok but meanings are a little bit different. 真的希望你能幸福 , 真的希望你可以幸福 - 有"的" , 表示真心祝福. Having 的 means a real wish and really hope something. Sometimes slightly be used in the situation "she isn't happy at the moment" but it depends on intonation . 真希望妳能幸福 , 真希望妳可以幸福 - 少了"的" , 有時候有同情的味道 ,表示現在他並不一定幸福. Lacking 的 sometimes be used in situation which is "she isn't happy at the moment" . It indicates that she/he isn't happy at this moment so you really hope she/he can be happy.

嘻嘻 = Laugh with your mouth not widely open and the sound isn't loudly produced . Sound like hehehe...

Several synonyms : This這 That 那 , Both correct in Chinese. 道理 = reason 邏輯 = logic 這(那)沒有道理啊 Common in Taiwan 這(那)沒有意義阿 這(那)沒有邏輯阿

The conditional sentences in Chinese are simpler then English. If = 如果you = 你 do = 做 will/would = 將會 regret = 後悔 later = 之後 were/are/is...be verb/ = 是 more = 更多 I = 我 , want = 想要 can =可以 , help 幫助 If you do it, you will regret later. 如果你做了 , 你(之後)(將)會後悔. ()可以省略 If I were you, I would study more. 如果我是你 , 我會讀更多 If you want, I can help you.如果你(想要/需要) , 我可以幫助你

雖然我說中文 , 不過兩者沒有巨大的差異 , 聽起來都可以 , 不過符合 = Match 遵守 = Obey / Follow. 看你想要用哪種方式表達.

你看起来比第一次来的时候胖了很多 is better and sounds more nature.

我很担心你""""的"""""身体。It sounds more nature. You can use "I'm worried about" as following . He eat junk foods everyday , 我很担心。 He have been single for 3o years , 我很担心。 Problem + 我很担心。 我很担心+ XXXXXX