By Past perfect, Using English

, "If circumstances had been different, they could've made a great couple.", the principle is again being used. Are there any Gurus or members who can make me understand this confusing English usage?

Susan, I understand the frustration you are feeling. Your language, Chinese, is what linguists call an "isolating language". All information, such as the time an action occurred, is conveyed by the choice and order of words in a sentence. There are no verb tenses. There are no plurals. In fact,...