zhèng hǎo
你来得正好
nǐ lái de zhènghǎo
You came at just the right time
这双鞋我穿正好
zhè shuāng xié wǒ chuān zhènghǎo
These shoes fit me perfectly
那笔钱正好买台电脑。
nà bǐ qián zhènghǎo mǎi tái diànnǎo
That amount of money is just enough to buy a computer