45.In that case， 既然那样
In that case, I have no more to say.
既然那样，我没什么好说的了.
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，我觉得为自己确立一个目标是非常重要的。
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
你出去的时候是否方便帮我寄这封信.
48.It depends on whether 这取决于是否
It depends on whether you are determined to do it or not.
这取决于你是否决心要做这件事情.
49.It doesnt make sense to没有任何意义
It doesnt make sense to argue with him.
和他争论没有任何意义.
50.It is/wasthat/who [强调句句型]
It was Edward who told me about it.
告诉我这件事的是爱德华.