The phrase 'แล้วแต่ (láew tàe)' in Thai is typically utilized to express the notion of 'depending on' or 'up to'. This phrase is generally employed in the structure of a sentence to show that a certain condition, decision, or outcome is subject to a particular situation, or it's based on an individual's preference or choice. Variably, the phrase can highlight an uncertainty, adding to the overall meaning of the sentence.