there is a flower in the garden, di ubah ke past tense, jadi apa?

there was a flower in the garden

Answer:
There was a flower in the garden.
To be --> is berubah jadi was(karena tunggal)

Tapi kalau kalimatnya begini:
There are some flowers in the garden.

Maka:
Tobe--> are berubah jadi were (karena jamak)

Thanks