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