I hope so 我希望如此,用于交際
比如：--- Maybe you will be better tomorrow!---I hope so.
I hope that-從句 比如：I hope that they can come to my help.我希望他們會來幫我.
I am afraid so...恐怕如此,恐怕這樣,用于交際
比如 --- Not many students can pass the exam.---- I am afraid so.
I am afraid -that -從句 I am afraid that I can't lend you the book because I am reading it myself.
恐怕不能借這本書給你,因為我自己在看!