我打算年底回国看父母。

Wǒ dǎsuàn niándǐ huíguó kàn fùmǔ.

I plan to go back to my home country at the end of the year to visit my parents.

如果一切顺利，我们年底就能毕业了。

Rúguǒ yíqiè shùnlì, wǒmen niándǐ jiù néng bìyè le.

If everything goes well, we can graduate at the end of the year.

因为年底很忙，他已经两个星期没休息了。

Yīnwèi niándǐ hěn máng, tā yǐjīng liǎng gè xīngqī méi xiūxi le.

Because it's very busy at the end of the year, he hasn't had a rest for two weeks.