爷爷一生喜欢看书，也喜欢教我们。

Yéye yìshēng xǐhuān kànshū, yě xǐhuān jiāo wǒmen.

Grandpa liked reading all his life and also liked teaching us.

我们一生会认识很多人，但好朋友不多。

Wǒmen yìshēng huì rènshi hěn duō rén, dàn hǎo péngyou bù duō.

In our whole life we will meet many people, but not many are good friends.

他一生都在这个城市工作。

Tā yìshēng dōu zài zhège chéngshì gōngzuò.

He worked in this city for his whole life.