In other words, ...
换句话说，……。
In other words, you should read and speak English crazily every day。
换句话说，你应该每天疯狂读英语，说英语。
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。
. 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。
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