你要是愿意道歉，她就不会那么生气了。

Nǐ yàoshi yuànyì dàoqiàn, tā jiù bú huì nàme shēngqì le.

If you're willing to apologize, she won't be so angry.

要是你有时间，可以来我家吃晚饭。

Yàoshi nǐ yǒu shíjiān, kěyǐ lái wǒ jiā chī wǎnfàn.

If you have time, you can come to my place for dinner.

要是下雨，我们就不去公园了。

Yàoshi xiàyǔ, wǒmen jiù bù qù gōngyuán le.

If it rains, we won't go to the park.