要是你明天有空，就来我家吧。
yàoshi nǐ míngtiān yǒukòng ， jiù lái wǒ jiā ba 。
If you're free tomorrow, come over.
要是下雨，我们就不去了。
yàoshi xiàyǔ ， wǒmen jiù bù qù le 。
If it rains, we won't go.
要是我是你，我就不买。
yàoshi wǒ shì nǐ ， wǒ jiù bù mǎi 。
If I were you, I wouldn't buy it.