英语翻译，，，

1.Time flies.
2.I am very glad to received your email, below are my opinion of your questions mentioned.
2.I write this letter is to apologized upon my rude act in the classroom yesterday.
4.Can't believe I already left Beijing for 2 years long. How are you?
5.I had to tell you some problem that I faced recently.

1 The time like arrow
2, you receive the message I am glad that I was following your issues
3 The purpose of this letter is in the classroom yesterday for the rude behavior of my apology to you
4 blink of an eye, I did not expect me to leave Beijing two years. Recently, how do you like?
5 I have to tell you that I recently encountered some trouble