一周才剛過半，他就累倒了。

　　By midweek he was too tired to go out.

　　我的精神集中不起來，大概是太累了吧。

　　I couldn't concentrate, presumably because I was so          tired.

　　一天結束時，我們很累，但很高興。

　　By the end of the day we were tired but happy.

　　孩子們越來越累，脾氣也有些變壞了。

　　The kids were getting tired and a little cranky.