1 There is a dog.
There isn't a dogThere is a piece of cake.
There isn't a piece of cake.
There is one dress.
There isn't one dress.
There are some students.
There aren't some students.
There are so many girls.
There aren't so many girls.
There are kids running.
There aren't kids running.
2. There was a dog.
There wasn't a dogThere was a piece of cake.
There wasn't a piece of cake.
There was one dress.
There wasn't one dress.
There were some students.
There weren't some students.
There were so many girls.
There weren't so many girls.
There were kids running.
There weren't kids running.
3 condicional cero : If you heat water to 100 degrees, it boils.
If public transport is efficient, people stop using their cars.
If you cross the line, you are in our countrycondicional 1 : If I have time, I’ll call you.
If she has enough money next year, she’ll buy a motorbike.
If I go to Paris, I’ll visit my friend John.
Condicional 2 : If I won the lottery, I would travel around the world.
If I were in Brazil, I would go to Rio de JaneiroIf I were you, I would buy that car.
Condicional 3 : If she had been there, I would have seen her.
If we had had more time, we would have visited Pompeii.
If I had studied more, I would have passed the exam.