had+ed是什么时态
had+ed是过去式
时态变化在助动词上做变化。完成时的构成是have(助动词)+v.ed,那么
现在完成时have/has(have的现在时形式)+v.ed
过去完成时had(have的过去时/式形式)+v.ed
结构
①肯定句主语+had+动词过去分词+其他。
②否定句主语+had+not+动词过去分词+其他。
③疑问句Had+主语+动词过去分词+其他?
肯定回答Yes,主语+had.
否定回答No,主语+hadn\'t.
④特殊疑问句特殊疑问词或词组+had+主语+过去分词+其他?
⑤被动语态主语+had(not) +been+动词过去分词+其他。
例句
过去完成时常用的时间状语有
1. by the end of last+时间段. By the end of last term, we had learned 5000 new words.
到上学期末,我们已经学了5000个新词。
2. By the time sb. +动词过去式如The bus had already left by the time I got there.
3.By (the time of)+时间段
By the time of last year ,we had built two bridges.