恐ろしい夢を見た

I had a scary dream

→ 恐ろしい
phrase Rare #32,533
I had a scary dream Literally means “saw a frightening dream,” but English naturally uses “have a dream.”
JA: 今朝、恐ろしい夢を見た。
EN: I had a scary dream this morning.

私は恐ろしい夢を見た

I had a terrifying dream.

昨晩恐ろしい夢を見た

I had a terrifying dream last night.

弟が昨晩恐ろしい夢を見たと言っている

My younger brother says he had a terrifying dream last night.

昨夜恐ろしい夢を見た

I had a terrifying dream last night.