同学你好，该知识点来自沪江网校《Hitalk口语【外教1V1】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学你好~
I have seen him demonstrated an excellent working ethic.  
demonstrate不带to的不定式做宾补，ethics复数
Besides, he never hesitated to help me all the time.  不需要再加all the time
And I thought that’s one way he delivers ONE culture in day to day work.  
think现在时即可

祝同学学习进步~