英语 能不能帮我看看这篇文章有没有语法错误?急.(15 11:16:19)

a large and grand ceremonies
“a”和“+s”不能同时出现,并且ceremony是仪式的意思,用在世博后面恐怕不太妥当,可以改成exhibition（展会）或者carnival（狂欢）
I can imagine that in Shanghai,has no national boundaries,
此处应改成I can imagine that there will be no national boundaries in Shanghai.
people from all over the world are discussing the changes here,not only the environment has become more sanitary,and construction is getting better and better.
应改成people from all over the world will discuss the changes here,not only including the more sanitary environment,but also the better and better construction.
My favorite is the mascot of World Expo - Hai Bao.
应该说是the mascot of 2010 shanghai expo,因为海宝仅仅是这一届世博的吉祥物,而不是所有的世博会
It opens arms to welcome the people from all over the world.
open和arms之间要加个it
I'm really looking forward to Shanghai World Expo,people of the motherland is also excited because of the Expo Olympics.
应该改成I'm really looking forward to Shanghai World Expo,all the Chinese are also excited about it.
没有EXPO OLYMPICS这种说法
I believe that the Expo would surely be a large success just as the 2008 Olympic Games.
would应该改成will,这里不是过去将来时
large应该改成great,large一般指体积上的庞大
just as应改成just like,just as是“正当……的时候”的意思
It has become difficult for other countries to replace the state,win glory for the whole of China!
应该改成It will make it more difficult for other countries to take the place of China and win the glory.

1.ceremony,因为前面是a.
2.has改为there are，有in了就不要用has了.
3.第三行and改为but also the 后面加construction.
4.large success改为great更好些.