桑堆:这段有那些语法错误。。？

The writer has just received his brother,Tim's letter. Tim is an enginner. He has already been for six mouths in Australia.He has already visted a great may different places. He is in the Alice.
Tim has never been abroad .so,He is exciting
同位语从句两端不对等，brother 和tim's letter.
He has been in Australia for 6 months.great many 不是may.now he is in Alice

He has already been for six mouths in Australia
应该删掉already

the writer has just received the letter from is brother Tim, Tim is an engineer. he has been staying in Australia for six months. He has visited a great many different places, He is in Alice.
Tim has never been abroad, so he is exciting.

着不是新概念第二册第四课吗？原文是：An Exciting Trip
I hve just received a letter from my brother Tim,He is in Australia .Has been there for six months .Tim is an engineer.He is working for a big firm and hs has already visited a great number of different places in Australia .He has just bought an Australia car and has gone to Alice Spring ,a small town in the centre of Australia . He will soon visit Darwin .From there,he will fly to Perth,My brother has never been abroad before, so he is finding this trip very exciting .