小学英语语法专题：时态的分类（现在完成时的构成和不同人称的用法）.docx

什么是现在完成时？
现在完成时指的是过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。

一. 基本构成：have / has+done（动词的过去分词p.p）
I have finished my homework.
我已完成了作业。（这里的finished就是动词finish的过去分词。）

二.动词过去分词变化规则
我们和动词过去式一起来记忆吧！
变化规则
动词原形
动词过去式
动词过去分词
A-A-A型
cut
cut
cut
put
put
put
read
read
read
set
set
set
hurt
hurt
hurt
let
let
let
shut
shut
shut
A-B-B型
bring
brought
brought
buy
bought
bought
keep
kept
kept
A-B-B型
build
built
built
send
sent
sent
spend
spent
spent
tell
told
told
think
thought
thought
teach
taught
taught
A-B-B型
say
said
said
meet
met
met
make
made
made
A-B-C型
begin
began
begun
drink    
drank
drunk
sing
sang
sung
ring
rang
rung
blow
blew
blown
fly
flew
flown
draw
drew
drawn
grow
grew
grown
drive
drove
driven
ride
rode
ridden
break
broke
breaken
freeze
froze
frozen
forget
forgot
forgetten
eat
ate
eaten
fall
fell
fallen
take
took
taken
go
went
gone
A-A-B型
beat
beat
beaten
A-B-A型
come
came
come
become
became
become
run
ran
run
学习小贴士
★情态动词没有过去分词。
★Be动词（am，is，are）的过去分词只有been.

三. 现在完成时不同人称的用法
I have washed my car.
我洗过车子了。
We have done the whole work.
我们干完了所有活儿。
They have gone.
他们已经走了。
Have you seen the doctor？
你看过医生了吗？
 He has been to Hong Kong.
他去过香港了。
The boy has walked for a long time.
这个男孩已经走了很长时间了。

学习小贴士
现在完成时中，主语是I/you/we/they时，助动词用have；主语是第三人称单数时，助动词用has。