One way to express cause, in much the same way as porque, in an explanatory subordinate clause is by introducing the clause with que.
Have a look and listen to the following examples:
Me voy al supermercado, que tengo que comprar.I'm going to the supermarket because I have to shop.
Vosotros vais a estudiar, que tenéis que aprender muchas cosas.You are going to study as you have lots to learn.
Vinisteis juntos a Madrid, que teníais una reunión de negocios.You came together to Madrid because you had a business meeting.
No he venido a trabajar hoy, que estoy enfermo.I didn't go to work today as I feel sick.
Notice how this que does not have an accent despite being in the beginning of the sentence. It is not a question word but a conjunction!
Let's look at the following example to understand how que works to express cause:
Voy a hablar con la profesora, que no entiendo nada.
We could easily have said the same with porque:
Voy a hablar con la profesora, porque no entiendo nada.
I am going to talk to the teacher because I don't understand anything.
See also Conjunción.
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