英语语法时态问题Mr.and Mrs.Smith are worried about their son,Tom.He

英语语法时态问题
Mr.and Mrs.Smith are worried about their son,Tom.He hasn't been(get on)very well at his school
1.这句句子括号里应该填什么时态,为什么要填写这个时态?
2.这句句子填写上这个时态应该如何翻译!