We use since as a preposition, a conjunction and an adverb to refer to a time, and as a conjunction to introduce a reason. […] When since introduces an action or event at a point of time in the past, we can use the past simple or present perfect after since and the present perfect in the main clause. SINCE. In: CAMBRIDGE Dictionary. Available at: . Accessed on: 17 Feb. 2020. O texto exemplifica e explica o uso da palavra since. A frase cujo emprego da preposição since faz referência a um tempo definido é:
