1. It is a great honour to be invited.
    承蒙邀请, 十分荣幸.

2. I invited all my colleagues to dinner tonight. Don´t you remember what day it is?
    我今晚邀请了所有的同事来吃晚餐, 你不记得什么日子吗?

3. It is presumption to go to a party when one has not been invited.
    未被邀请而去参加宴会是冒昧的。