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。
When the cat's away the mice will play.
猫儿不在,老鼠造反。
I even went out at midnight with a torch and noted with satisfaction (and surprise) that the ants were still swarming around the sticky tape without being able to do anything about it.