What is left and leaving?

Left is the past tense and past participle of the verb "leave". It is used to indicate that someone or something has departed or abandoned a particular place or situation.

Leaving, on the other hand, is the present participle of the verb "leave". It refers to the act of departing or going away from a place or situation, and is commonly used to indicate that someone is about to leave or has made the decision to leave.

Both left and leaving are commonly used in everyday speech and writing, and are important concepts in understanding relationships, personal and professional decisions, and movement in general.