прошлым

прошлым

"Прошлым" means "past" (in the instrumental case).

The word 'прошлым' serves as an adjective in instrumental case modifying 'году,' indicating 'last year'.

В прошлом году мы ездили на море.

Last year, we went to the sea.

The word 'прошлым' is the plural instrumental case of the adjective 'прошлый,' here describing 'ошибках' (mistakes) in past tense context.

Он вспомнил о своих прошлых ошибках.

He remembered his past mistakes.

The word 'прошлым' in its nominal form 'в прошлом' refers to 'in the past,' indicating past events or situations.

В прошлом мы часто играли во дворе.

In the past, we often played in the yard.