I believe that… 我相信
I believe that there is no difference between men and women in the work place.
我相信男人跟女人在职场上是没有差别的。
I assume(d) that… 我猜想
I assumed that you knew each other because you went to the same school.
我猜你们应该认识因为你们念同一所学校。
In my opinion/ point of view… 我认为 〔我的看法是…〕
In my opinion, university students should enroll in internships before they graduate.
我认为大学生毕业前都应该要有实习经验。
It is my belief/view/opinion that… 我觉得/认为
It is my belief that one’s zodiac sign can affect his or her personality.
我认为星座是会影响一个人的性格的。
The way I see it… 就我看来
The way I see it, the education reform was just a disaster.
就我看来,教育改革简直是一场灾难。
As far as I can tell… 就我所知
As far as I can tell, you can never learn a language well unless you start to speak it.
就我所知,想要学好一个语言不开口说是不行的。