现在完成时的结构

1\have/has+过去分词 （动作已经结束）
我已经完成作业了.
I have finished my homework.

2\have/has+been doing (现在还在继续）
我已经学习了八年英语了.
I have been studying English for eight years.

have/has +过去分词

have/has+动词过去分词

现在完成时

现在完成时的基本构成方式是用动词have加上过去分词。它是用来表达过去发生事情的另一种方式。

He has studied English and French.
他学习过英语和法语。
I have read many books.
我读过很多书。

通常一个动词的过去分词和他的过去式是一样的，但是有一些动词的过去分词有不规则的形式。

be been
go gone
come
come
run
run
swim swum
fly
flown
see
seen
speak spoken
do done
give
given
hide hidden
become become
take
taken
get gotten / got
break broken
shake shaken
wake
waken
awake awaken
rise risen
lay lain
fall fallen
begin begun
know known
forget
forgotten
write