Verb THERE IS/THERE ARE (haber)

and... remember!!! In the singular, we use a/an before the noun:

A: There is a keyring on the table / There is an apple in the box.
N: There isn't a keyring on the table / There isn't an apple in the box.
I: Is there a keyring on the table? / Is there an apple in the box?
S
A: Yes, there is/No, there isn't.

and in the plural, we use SOME for the affirmative sentences and ANY for the negative and interrogative sentences:

A: There are some magnets on the fridge.
N: There aren't any magnets on the fridge.
I: Are there any magnets on the fridge?
S
A: Yes, there are/No, there aren't.

Practise this verb here

Past Simple Tense

  PAST SIMPLE TENSE
                             

You can find some past simple exercises here.