麻烦大家帮我修改一篇英语作文呗 初三英语 帮我看一下有没有不通顺的句子,和语法错误

麻烦大家帮我修改一篇英语作文呗 初三英语 帮我看一下有没有不通顺的句子,和语法错误
Dear Tony,
The customs in our country are very different from yours. If you want to visit a frieng's house,you should knock at the door first. After you come into the room,you would not sit down until the host asks you to take a seat. And it's rude to ask about how much the things are. Another thing is that it is very rude to say you're full. If you don't want any more food,you should just say,"It was delicious." I have to say it difficult for you to remember everything,but I believe you're gradually getting used to things. Hope you're having a good trip.
Yours