记住一下习惯用法：
1 believe it or not
2 to tell you the truth
3 given that + 句子,句子
4 given + 短语,句子
5 generally speaking
6 call a spade a spade
7 to be frank with you
8 make hay while the sun shines
针对习惯用法,你只能记住,一般来说,是问不出所以然的.