きのうは あめでした/ it was rain.
きのう
means "yesterday".
あめ
means "rain" as noun.
あめでした
means "was rain.". "でした" is the past tense form of "です".
きのうは あめでした
means "it was rain.".
means "yesterday".
means "rain" as noun.
means "was rain.". "でした" is the past tense form of "です".
means "it was rain.".