我不知道买什么礼物给她好。

Wǒ bù zhīdào mǎi shénme lǐwù gěi tā hǎo.

I don't know what gift to buy for her.

我送了一份大礼物给她。

Wǒ sòng le yí fèn dà lǐwù gěi tā.

I gave her a big gift.

这支笔是我的生日礼物。

Zhè zhī bǐ shì wǒde shēngrì lǐwù.

This pen is my birthday present.