past
The German word 'Vergangenheit' is used to refer to the past, both in a general sense and as a specific point in time. It is often used in the context of discussing history or past events. However, it is also used in a more abstract sense to refer to the past as a concept, such as in the phrase 'Die Vergangenheit ist nicht zu ändern' (The past cannot be changed).
I made many mistakes in the past.
This sentence portrays the speaker expressing regret for errors they made in the past. 'Vergangenheit' is used here to refer to the speaker's past.
The past can teach us a lot.
This sentence implies that by reflecting on our past actions and events, we can learn valuable lessons. 'Vergangenheit' in the sentence means 'past'.
Past, present and future are parts of our time.
This sentence is a statement communicating that time is divided into past (Vergangenheit), present (Gegenwart), and future (Zukunft). Here 'Vergangenheit' is used as a noun to mean 'past'.