Among students, it has some students who know English and I do not know any English. When some people have no knowledge of English. Not make conversation with others.
A group of students, there are some students who มก็ knowledge of English and no knowledge of English. When someone has no knowledge of the English language. Not willing to chat with other people.
Students in the group, some of the students have some knowledge in English and there is no knowledge of English, when some of them do not have a knowledge of English, it didn't have the courage to speak of.