Question

there was a policeman at the house. no plural​

Answer 1

⇒⇒  There was / There were

There was a policeman at the house. (singular)

There were policemen at the houses.   (plural)

⇒⇒  There to be - verbo haver / existir

Estrutura Simple present

There is >>> singular

There is a car in front of the Mall.

There are >> plural

There are three cats in the garden.

Estrutura Simple Past

There was - simple past - singular  

There was a dog here. - Havia um cachorro aqui.  

There was a nice girl there. - Havia uma menina bonita ali.  

There were - simple past - plural  

There were kids playing golf. - Havia meninos jogando golfe.  

There were some girls at the Mall. - Havia algumas meninas no shopping.

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