本文主要学习英语中的完成时，包括：现在完成时，过去完成时，过去完成进行时。
一、现在完成时（Present Perfect Tense）
verb to have + past participle
1，There are a prototype, a past tense, and a past participle for every verb
Prototype past tense past participle
go went gone
come came come
see saw seen
do did done
get got got
have had had
buy bought bought
draw drew drawn
leave left left
write wrote written
run ran run
swim swam swum
eat ate eaten
fly flew flown
spread spread spread
hit hit hit
drink drank drunk
take took taken
grow grew grown
sell sold sold
ride rode ridden
steal stole stolen
break broke broken
read read read
sing sang sung
现在完成时用法：http://www.hjenglish.com/yufadaquan/p618105/
现在完成时的四种用法：http://www.yygrammar.com/Article/201112/2725.html
2，现在完成时的一般用法
现在完成时表示过去发生并已经完成的动作，强调对现在造成影响或后果，或者过去某一时刻开始并持续到现在的动作或状态。
基本结构：subject + have/has +past participle
1) Positive sentences : subject + have/has + past participle + object
2) Negative sentences: subject + have/has not + past participle + object
3) Common interrogative sentences: Have/has + subject + past participle + object
4) Special interrogative sentences: What/how/where/when + have/has + subject + past participle +...
3，过去分词
1）规则动词 + ed
2）以‘e’结尾的动词 + d
3）以“辅音+y”结尾的动词： 将y改为i，+ ed
4）重读，闭音节结尾，末尾只有一个辅音字母，双向辅音字母，+ed
eg: stopped, dropped,
5）不规则动词： AAA AAB ABA ABC