怎样区分英语状语从句、宾语从句和定语从句,他们各有什么特点?

怎样区分英语状语从句、宾语从句和定语从句,他们各有什么特点?
另外帮忙做几个题吧
1.-------- you have tired it on ,youcan't imagine how pretty the style skirt is.
A. Because B.Although
C. UnlessC.When
2.I wonder --------.
I'm afraid we will be late.
A.how we can be on time
B.what we are going to do
C.why we get to school late
D.if we will arrive at the meeting on time
3.Could you please tell me-------?
Sorry ,you can turn to Mr.lee for help
A.how can man live without water
B.whether Yao Ming would play for Rockets or not
C.how I can keep myself safe from the flu
D.why did a serious landslide happen in Zhouqu , Gansun Province
帮忙解释一下吧