He has been a student.请帮我

He has been a student.请帮我 he is a student.he had been a student/ he has been a student he was a student.he has been a student.从理解上有什么区别 If a student can make what has been learned---,he will make 谁帮我这段话?A problem has been detected and windows has been shut 请帮我翻译一篇文章For a number of years, there has been a steady rise He has a （ball）?,请帮我把括号里的词改成疑问句. he has been learning english a year he has always been a good neighbour. He has always been a good neighbor 请高手详细分析Though my brother has been in Australia for a year,he Has Tim ever been abroad before or not?请帮我回答一下这个句子.