If a time machine existed, I would want to go back and correct my mistakes.

Hello, have you seen your mobile phone?

Since the results of the mock exam were not good, I have to study more.

I have a mock exam for math tomorrow.

Please forgive my fault.

His existence enriches my life.

You can feel his presence.

If you have an accident, please contact the police immediately.

What is this machine used for?

I plan to return to Tokyo tomorrow.