Then can be used as an adverb, conjunction, or noun, and has various meanings and uses.1. Adverb: In this sense, then is used to indicate a sequence of events or time. For example, "I spoke to him, and then he left" means that he left after I spoke to him.2. Conjunction: Then can also be used to introduce a consequence or result. For example, "If it rains, then we will stay inside" means that staying inside is the consequence of rain.3. Noun: Then can also be used as a noun to refer to a specific time or moment in the past or future. For example, "Back then, we used to play in the park every day" refers to a specific time in the past.Overall, then is a versatile word that can be used in different ways to indicate time, sequence, consequence, or reference to a specific point in time.
