He/She is a good student.
They are friendly boys.
He/She is going to beijing.
第三跟第四句就是间接引语了，不用转换了
不知道是谁跟谁说的， 要转述给谁的，说实在话有点难度，姑且一试
you are regarded as a good student/sb. regards you as a good student.
it's said that you are friendly.
i hear he has gone to chengdu.这句我改的可能有问题
i heard she was sad then.
it's said that he/she is going to beijing.
可能都不太应景，能力有限呵呵
建议下次题目给仔细点儿啊，因为英语的理解在很多情况下是需要语境的
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