I am expecting your reply!这句很很好的,适合于书信中.
I am looking forward to hearing from you!能表达出你急切的心情.
I look forward to receiving your reply.
这3句都译为我期望收到您的回复.
"我可以帮助你学汉语和中国文化"
I can help you with your Chinese and Chinese culture!
这话肯定没错,也比较标准.