現在完成時：動名型have+過去分詞，系表型have been+表語。現在完成時，表示曾經有過的經驗，表示過去某種行為的結果對現在有直接的影響，表示某經歷的時間長度。過去完成時結構：主語+had+done+sth。有before+、by+過去的時間點的時間狀語時用過去完成時態。

完成時態的句子

I had writed half of book by the end of last week. 在上周之前，我就已經寫了半本書了。

I had finished my homework by the end of hoilday. 我在假期結束之前就做完了作業。

I have finished my homework.我已經做完作業了 。

I have had breakfast.我已經吃過早飯了。

The teacher had teached one thousand words by the end of last term. 上學期結束之前，老師就已經教了一千個單詞了。