1. That/Which:
* "El libro que leí era interesante." (The book that I read was interesting.)
* "La mujer que me ayudó es mi hermana." (The woman who helped me is my sister.)
2. What:
* "¿Qué quieres comer?" (What do you want to eat?)
* "No sé qué hacer." (I don't know what to do.)
3. Than:
* "Ella es más alta que yo." (She is taller than me.)
* "Este libro es mejor que el otro." (This book is better than the other.)
4. How:
* "¿Qué tal estás?" (How are you?)
* "No sé cómo hacerlo." (I don't know how to do it.)
5. Because:
* "No pude ir, que tenía que trabajar." (I couldn't go because I had to work.)
* "No te preocupes, que todo va a estar bien." (Don't worry, because everything will be okay.)
6. Exclamatory:
* ¡Qué lindo día hace! (What a beautiful day it is!)
* ¡Qué pena que no puedas venir! (What a shame that you can't come!)
To understand the meaning of "que" in a specific sentence, it's important to consider the context and the surrounding words.
Please note that the meaning of "que" can be very flexible in Spanish, and it often takes on nuanced meanings depending on the situation.