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 The equipment was outdated.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