I am writing this letter to thank you.
Bus fares are going up today.
He is not taking the exam this year.
They aren't having a lesson at the moment.
Am I disturbing you?
How much are they going up by?
Who is taking the exam this year?
They aren't having a lesson at the moment?
Why aren't they having a lesson?
NOTICE: For spelling problems with the -ing form of the verb, look at Lesson 92.
Be quiet! The Prime Minister is speaking.
They are having dinner at the moment.
What are you doing?
She is staying at the Metropolitan Hotel.
He isn't feeling very well today.
Quick! The bus is stopping.
Pollution in the city is getting worse.
EXAMPLE: We are leaving at ten o'clock tomorrow.