We're organizing an informal party, and I'd like you to come.
我们计划组织一个非正式聚会,我想请你参加。
How ofter did I tell you to sit straight?
我告诉你多少次要坐正?
If you want to send a letter to an office abroad that is in a different time zone, you can send a fax, and it will be received even though the office is not open.