invitation letter谁写过全家想去美国玩儿,需要美国的朋友写一个invitation letter,但他写的太简单了,如下：I am happy to invite you and your family to visit me and my family at my home in California, NY any time from September 1, 2009 to October 31, 2009. I look forward to seeing you and your family again!希望有写过的人可以指导一下,主要是充实一下,这样太简单了.ps：用英文充实.（或者如果你知道比较好的写法,如果不知道英文怎么写,给出中文意见也可.）

不就是玩儿么，你还想要几万字?

这个本来就是邀请函，没有必要写那么复杂显示自己的英语水平，这样反而让人觉得……言简意赅就可以了

invitation letter 并不需要很复杂的,主要交代清楚邀请对象,时间,地点,以及邀请方就可以了,下面提供的还是比较中国思维化.
Invitation
dear ***,
I will be pleased to see you and your families to visit my family in NY City,California.You can come here at any time between 1st September and 31st October ,2009.
best wishes
yours,
***

我觉得上面写的就足够了，有签名就ok了。
不过他第一句话太那个啥子了……还是可以哈。