Davis xiānshēng kàn shàngqù hěn lèi. Mr Davis looks very tired.
You are tired, aren't you?
Yào juédìng zài jiérì de shíhòu chuān shénme shì jiàn lèi rén de shì. It's a hassle trying to decide what to wear to the party.
Wǒ lèi dé bùnéng zài lèile. I couldn't be any more tired.