1.现在完成时,I have told you all my misery. 我已经告诉了你我的一切痛苦。表示已经,做过..但对现在有意义。如本句,"你该记得" .He has eaten a whole box of chocolates. 他吃了一整盒巧克力。 2.过去完成时;I failed to note that he had left. 我没有注意到他已经走了。过去发生的动作之前已经发生的的动作。当注意到时,他已经不在了。过去完成的动作;She had her portrait painted. 她让人给自己画了像。 3.将来完成时态,即将来要完成的动作或状态 The old currency will have been phased out by 1990. 旧币分阶段至1990年将全部禁止流通. 给你个语法大全网址,收藏,很权威,很全面,不再受骗。
http://www.52en.com/whbm/grammar/index.htm现在完成I have been to China.过去完成I had been to China when I was 10.将来完成I will have arrived at China if you come 2 more days late!