1.Once you've made up your mind,don't give up whatever difficulty you may meet with.
2.It is certain that you will be fined if you park your bicycle in the Nanjing Road.
3.Tom is anxious to find out whether his father will keep his word and buy him a bicycle.
问题
1.if 引导名词性从句,意思是“是否”；引导条件状语从句,意思是“如果”.
2.一般情况下都能省略.