I must sit down and rest, I am tired out. 我一定得坐下歇一歇，我累极了。
The children were tired out when they arrived home-they'd had the time of their lives playing in the mud, without their parents there to tell them to keep clean. 孩子们回家时都累坏了——他们在泥地时玩耍，没有父母在身边叮嘱他们保持干净，玩得开心极了。
