Since is a versatile word in English language that can be used as a preposition, conjunction, adverb or noun. As a preposition, it means “from a specified time in the past; (expressing indignation) ever”. As a conjunction, it means “from a specified time in the past; because”. As an adverb, it means “from a specified time in the past; afterward; before”. As a noun, it means “(surname) Xin Si (name in Chinese)”.
【since后面用什么时态】The simple past tense is used to indicate actions or states that occurred in the past at a specific time or as a habitual or frequent action in the past. In English grammar, “tense” refers to the time when an action occurs, while “aspect” refers to the manner and state of the action.
