1. Verb To be (Simple Past)
Haver (Existir)

2. Present. Past Affirmative form
Present Past Affirmative form There is a nation called Brazil There was a man called Cabral There are some Indians there now There were Indians in Brazil in 1500

3. There is not (There isn´t) There was not (There wasn´t)
Present Past
Negative form
There is not (There isn´t) There was not (There wasn´t)
There are not (There aren´t) There were not (There weren´t)

4. Present Past
Interrogative form Is there...? Was there...? Are there...? Were There...?
Was there a monarchy in the history of Brazil? Yes, there was
Were there flowers in the garden. No, there weren´t

5. Short answers Yes, there is/are Yes, there was/were
No, there isn´t/aren´t No, there wasn´t/weren´t