Notes from today's class on time clauses

I head home after I go to the store.

After I go to the store, I head home.

 Before I go to bed each night, I brush my teeth.

I brush my teeth before I go to bed each night.

You missed the test because you were late for class.

Because you were late for class, you missed the test.

 Before class started, some students ate lunch.

1: Lunch

2: Class

Some students ate lunch before class started.

1. Lunch
2. Class

After class ended last week, Bow had a question.

1. Class ended
2. Bow had a question

While I was driving, I was listening to the radio.

While I was driving, I saw an accident on the road.

I saw an accident on the road while I was driving.

First, the a/c died.

Then, Mahi fell asleep.

As soon as the a/c died, Mahi fell asleep.

Mahi fell asleep as soon as the a/c died.

 As soon as Mahi fell asleep, the a/c died.

1. Mahi fell asleep
2. a/c died 

As soon as I finish this lesson, I will give you a break. (FUTURE TIME CLAUSE)

1. Finish the lesson
2. Give a break

When the rain began, I opened my umbrella.

1. Rain
2. Umbrella

As soon as I opened my umbrella, the rain began.

1. Umbrella
2. Rain

I woke up. The sun rose.

When I woke up, the sun rose.

1. I woke up
2. The sun rose

The sun rose when I woke up.

1. I woke up
2. The sun rose

When the sun rose, I woke up.

1. The sun rose
2. I woke up

I woke up when the sun rose.

1. The sun rose
2. I woke up

My neighbor knocked at the door.

I answered it.

When my neighbor knocked at the door, I answered it.

1. Neighbor knocked
2. I answered

I answered the door when the neighbor knocked.

What’s the rule? If 2 events happened in the simple past with when (or as soon as), the when-event (or the as soon as-event) happened first.