Present perfect/ Past perfect、present--present perfect(現在式用現在完成式)、Who is that woman? I have never seen her before.那女人是誰?我過去沒見過她、past ---past perfect(過去式用過去完成式)、I didn't know who she was. I had never seen her before.我不知她是誰.我過去沒見過她、We aren't hungry. We've had lunch earlier.我们現在不餓.我們稍早吃過午餐、famine饑荒、Somalia索馬利亞、fighting hunger對抗饑餓、region in crisis危急地區、Kenya 肯亞