Which key word indicates the sentence is about an effect?

I did not set my alarm, so I was late for school.

Explanation:

This lesson is about cause and effect.

We are finding the effect of this sentence.

Let´s take a look,

What is the effect in this sentence?

so I was late for school.

The cause?

I did not set my alarm,

There are keywords that indicate an effect about to happen.

In this case would be so, as it shows that because You did not set your alarm, you were late to school.