Yes, there has been a war in the United States
Nobody has ever climbed that mountain.
the letter is being written by Tom.
Has there ever been a war in the United States?
Lisa has not been practicing her English.
They learn.
She has been working at that company for three years.
She loves this chocolate ice cream
People have not traveled to Mars.
You have seen that movie many times.
Why has Nancy not been taking her medicine for the last three days?
Bogota is in Colombia.
You are not swimming now.
I am reading the book Tom Sawyer.
Call your mother.
Do children like animals?
Recently, the work has been being done by John
I am studying to become a doctor
You have been waiting here for two hours
The train leaves at 10:00.
Joan has studied two foreign languages.
