一准

tā yī zhǔn kě kào

他一准可靠。

He is as reliable as a pin.

jīn tiān wǒ yī zhǔn jìn chéng

今天我一准进城。

I'll surely go to town today.

nǐ yī zhǔn lái ma

你一准来吗？

Are you sure to come?

nǐ yī zhǔn shì nǎo zi chū máo bìng le

你一准是脑子出毛病了。

You must be going soft in the head.