你来得正好。

Nǐ lái de zhènghǎo.

You came just in time.

我觉得这个菜正好。不会太咸也不会太辣。

Wǒ juéde zhège cài zhènghǎo. Bú huì tài xián yě bú huì tài là.

I think this dish is perfect; it isn't too salty and also isn't too spicy.

这么巧你打给我，我正好想打给你！

Zhème qiǎo nǐ dǎ gěi wǒ, wǒ zhènghǎo xiǎng dǎ gěi nǐ!

What a coincidence you called me, I was just thinking about calling you!