In other words, ...

　　換句話說，。

　　In other words, you should read and speak English crazily every day。

　　換句話說，你應該每天瘋狂讀英語，說英語。

　　In that case,

　　既然那樣，。

　　In that case, I have no more to say。

　　既然那樣，我沒什么好說的了。

　　. ...is of great importance.

　　....很重要.

　　If you want to succeed in life, I think to set a goal for yourself is of great importance。

　　如果你想在生活中成功，我覺得為自己確立一個目標是非常重要的。

　　Is it convenient for you to...

　　你是否方便

　　Is it convenient for you to post this letter for me when you go out

　　你出去的時候是否方便幫我寄這封信