准是

tā zhǔn shì zài hēi àn zhōng guǎi cuò wān le

她准是在黑暗中拐错弯了。

She must have taken a wrong turning in the dark.

tā jué de zì jǐ zhǔn shì sǐ le

她觉得自己准是死了。

She thought she must be dead.