Let you know:让你知道……
例句:
我们一得出结论，我就会让你知道。
I will let you know about it as soon as we come to any conclusion
我们一得出结论，我就告诉你。
Ⅰ will tell you about it as soon as we come to any conclusion.
tell you:
告诉你如何做;对你说;告诉你;
例句:
Any high school student could tell you the answer.随便一个高中生都可以告诉你答案。
