They were walking through the park. It suddenly started to rain.
when / while / as
You don’t hurry. You will miss the bus.
if
She didn’t follow the instructions carefully. She made several mistakes.
He did not want to make any mistakes. He carefully checked his answers.
because / since / as
The experiment failed. The equipment was outdated.
because
I want to improve my confidence. I practice public speaking every day.
because / since / as
The astronaut felt very nervous. She stepped onto the Moon.
She didn’t understand the lesson. She asked the teacher for help.
My mom is cooking. My dad is reading a newspaper.
While
The students had revised thoroughly. They still felt nervous before the exam.
The rocket launched late. There was a problem with the engine.
because / since / as
I brush my teeth. I go to bed
before
We finish all of our homework. We help Mom to clean the house.
after / when / as / since
I was 5 years old. I started to learn English.
when
The mission was dangerous. The team continued their work.
I were a bird. I would be a dove.
if
He kept running. He was tired.
I reviewed very hard for the test. I got low score.
although
The rocket launched. The countdown reached zero.
when / since / as
I will wait here. You come back.
until
The astronaut put on the helmet. The astronaut left the spacecraft.
before