45.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.

　　46 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。

　　47. 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.

　　48.It depends on whether 這取決于是否

　　It depends on whether you are determined to do it or not.

　　這取決于你是否決心要做這件事情.

　　49.It doesnt make sense to沒有任何意義

　　It doesnt make sense to argue with him.

　　和他爭論沒有任何意義.

　　50.It is/wasthat/who [強調句句型]

　　It was Edward who told me about it.

　　告訴我這件事的是愛德華.