I am writing.
I was writing.
My little sister is sleeping.
My little sister was sleeping.
My friends are not doing, they are playing.
My friends were not doing, they were playing.
She was reading.
She is not reading.
She is going.
What are you doing, I am drinking.
Were you drinking, I was not drinking, I was eating.
She was reading, she is reading.
My cat is playing.
The sun was shining, birds were singing.
Are you eating.
Were you eating.
What is your father doing.
What was your father doing.
Why is she crying.
Why was she crying.
I am enjoying.