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(jié)束時(shí)，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.