Provided/Providing （that）
结构︰Provided/provided（that）+子句，S+V
说明︰此句型意为如果。Provided/Providing （that） 引导假设条件句，其功能相当于 if.
Provided/Providing （that） you clear your desk by this evening, you can have tomorrow off.
如果你到今晚把手头上的工作做完，你明天就可以休息。
As/So long as
结构︰As/So long as +子句，S+V
说明︰此句型意为如果，只要。As/So long as引导一个条件假设句，其功能相当于 if.
So （As） long as you clear your desk by this evening, you can have tomorrow leave.
如果你到今晚把手头上的工作做完，你明天就可以休息。
As long as you drive carefully, you will be very safe.
如果你开车小心，你就会很安全。
You may eat anything, so long as you dont eat too much.
只要不吃得太多，你可以吃任何东西。
As long as live, I will help you.
只要我活着，我都会帮助你。
As long as you dont betray me, Ill do whatever you ask me to （do）.
只要你不出卖我，要我做什么我都愿意。
Well ship the goods at an early time as long as there is a steamer.
只要有船，我们就尽早装货。
You will never be good students so long as you goof around.
如果你们成天游手好闲，就永远也成不了好学生。