The phrase 'แล้วแต่ (láew dtàe)' is versatile and mainly used to express the concept of 'depending on' or 'it's up to' in Thai, it suggests that the outcome or decision depends on certain factors or circumstances. This phrase can be used when the speaker doesn’t want to specify, or it isn’t specified who or what the decision is dependent on. Contrary to 'เสมอ (sà-mǒer)' it allows for variability and changeability.