How is the weather today?

Hello, have you seen your mobile phone?

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

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

I have a mock exam for math tomorrow.

I will attend the meeting in his place.

I exchanged seats with him.

Would you like a second helping if you don't mind?

He always comes up with weird ideas.

There is absolutely no positive change in his attitude.