Crear actividad
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1. continuous
2. simple
3. perfect
4. perfect continuous

You have been waiting here for two hours

Lisa has not been practicing her English.

Call your mother.

Has there ever been a war in the United States?

I am reading the book Tom Sawyer.

Nobody has ever climbed that mountain.

Do children like animals?

Joan has studied two foreign languages.

Bogota is in Colombia.

You have seen that movie many times.

Yes, there has been a war in the United States

People have not traveled to Mars.

Why has Nancy not been taking her medicine for the last three days?

She has been working at that company for three years.

Recently, the work has been being done by John

The train leaves at 10:00.

She loves this chocolate ice cream

the letter is being written by Tom.

They learn.

You are not swimming now.

I am studying to become a doctor