"before" is OK. With "since", I think it would be better, for the harmony of tenses, to change "showed" to "had shown". As you say, the meanings are completely different.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
GPYWith "since", I think it would be better, for the harmony of tenses, to change "showed" to "had shown".Is "showed" wrong? Must I make the tenses harmonious?
tonyscottAnd interestingly, it seems to me that the change of the tense will cause a change in the meaning of the sentence. I don't know if this switch in the meaning really exists:Nearly three months had gone by since the seriously injured girl showed a slight sign of recovery.---After three months, the girl no longer showed the sign of recovery.Nearly three months had g