"COMO PASA EL TIEMPO" IN ENGLISH?
Specific expressions in one language can be difficult to translate into another without losing some of the meaning. The temptation with "como pasa el tiempo" is to create a Spanglish version that would be something like: "how the time passes".
To be honest, a native person might be able to understand what you are trying to say but there is a better version: "how time flies" or more specifically: "how time flies when you are having fun". So, for example: "How time flies when you are learning English, especially when you have a good teacher!"
Hope that helps!
Soy el director de Daniel Smith + Partners. Tengo más de 10 años de experiencia enseñando inglés a españoles.