用英文评价努力又害羞的学生:She/He is a hard working student. She /He has achieved good results in her/his all subjects. But she/ he is a bit shy and nervous she / he in public. She/ he will improve this very soon, I believe.
要用英文评价学生肯定他的努力,还要给予极大信心才能避免害羞的学生没有自信:Dear students, we evaluate your efforts to make a great performance, then we like to encourage you all get stronger confidence to perform best next steps.