① 肯定句: 主语+had +过去分词pp.
I had run out of my money before he came here.(came过去了,run out of 在came之前发生了,即过去的过去)
② 否定句:主语+hadn’t +过去分词pp.
I ________ ________ out of my money before he came here.
③ 一般疑问句: Had +主语+过去分词pp.+、、、、、、?Yes, ....had. No, ....hadn’t.