如题所述
现在完成时have/has
done
+过去分词(现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在)
例:I
have
done
my
homework.(已经)
过去完成时had
done+过去分词(表示在过去某一时刻或动作以前完成了的动作,也可以说过去的时间关于过去的动作。即“过去的过去”。可以用by,
before等介词短语或一个时间状语从句来表示,也可以用一个表示过去的动作来表示,还可能通过上下文来表示)
例:Mr.
Smith
died
yesterday.
He
had
been
a
good
friend
of
mine.(过去的过去)
1
、
规则动词
:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则:
(1)、一般动词,在词尾直接加“
ed
”。
work---worked---worked
,visit---visited---visited
(2)、以“
e
”结尾的动词,只在词尾加“
d
”。
live---lived---lived
,
(3)、以“辅音字母
+
y
”结尾的动词,将
"y"
变为
"i"
,再加“
ed
”。
study---studied---studied
,cry---cried---cried
,
play---played---played
,stay---stayed---stayed
(4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“
ed
”。
stop---stopped---stopped
,
drop---dropped--dropped
2
、
不规则动词
:
AAA型
原型
过去式
过去分词
burst
burst
burst
cast
cast
cast
cost
cost
cost
cut
cut
cut
hit
hit
hit
hurt
hurt
hurt
put
put
put
set
set
set
shut
shut
shut
spread
spread
spread
let
let
let
AAB型
beat
beat
beaten
ABA型
become
became
become
run
ran
run
come
came
come
特殊情况
read
read
read
read原形发音为/ri:d/,过去式和过去分词发音为/red/
ABB型
bring
brought
brought
buy
bought
bought
build
built
built
burn
burnt
burnt
catch
caught
caught
dig
dug
dug
feel
felt
felt
fight
fought
fought
find
found
found
hear
heard
heard
hold
held
held
keep
kept
kept
lay
laid
laid
lead
led
led
lose
lost
lost
make
made
made
meet
met
met
sell
sold
sold
shoot
shot
shot
sit
sat
sat
stand
stood
stood
sweep
swept
swept
teach
taught
taught
tell
told
told
think
thought
thought
win
won
won
ABC型
begin
began
begun
blow
blew
blown
break
broke
broken
choose
chose
chosen
draw
drew
drawn
drive
drove
driven
drink
drank
drunk
fly
flew
flown
forgive
forgave
forgiven
forget
forgot
forgotten
freeze
froze
frozen
give
gave
given
grow
grew
grown
know
knew
known
ride
rode
ridden
rise
rose
risen
ring
rang
rung
shake
shook
shaken
sing
sang
sung
sink
sank
sunk
swim
swam
swum
throw
threw
thrown
write
wrote
written
数学:根号两边平方,哪个大就选哪个,根号6的平方为36,根号7平方为49,因为36比49小,所以根号6小于根号7。
done
+过去分词(现在完成时用来表示现在之前已发生过或完成的动作或状态,但其结果却和现在有联系,也就是说,动作或状态发生在过去但它的影响现在还存在)
例:I
have
done
my
homework.(已经)
过去完成时had
done+过去分词(表示在过去某一时刻或动作以前完成了的动作,也可以说过去的时间关于过去的动作。即“过去的过去”。可以用by,
before等介词短语或一个时间状语从句来表示,也可以用一个表示过去的动作来表示,还可能通过上下文来表示)
例:Mr.
Smith
died
yesterday.
He
had
been
a
good
friend
of
mine.(过去的过去)
1
、
规则动词
:规则动词的过去分词的构成规则与规则动词的过去式的构成规则相同。四点变化规则:
(1)、一般动词,在词尾直接加“
ed
”。
work---worked---worked
,visit---visited---visited
(2)、以“
e
”结尾的动词,只在词尾加“
d
”。
live---lived---lived
,
(3)、以“辅音字母
+
y
”结尾的动词,将
"y"
变为
"i"
,再加“
ed
”。
study---studied---studied
,cry---cried---cried
,
play---played---played
,stay---stayed---stayed
(4)、重读闭音节结尾,末尾只有一个辅音字母,先双写该辅音字母,再加“
ed
”。
stop---stopped---stopped
,
drop---dropped--dropped
2
、
不规则动词
:
AAA型
原型
过去式
过去分词
burst
burst
burst
cast
cast
cast
cost
cost
cost
cut
cut
cut
hit
hit
hit
hurt
hurt
hurt
put
put
put
set
set
set
shut
shut
shut
spread
spread
spread
let
let
let
AAB型
beat
beat
beaten
ABA型
become
became
become
run
ran
run
come
came
come
特殊情况
read
read
read
read原形发音为/ri:d/,过去式和过去分词发音为/red/
ABB型
bring
brought
brought
buy
bought
bought
build
built
built
burn
burnt
burnt
catch
caught
caught
dig
dug
dug
feel
felt
felt
fight
fought
fought
find
found
found
hear
heard
heard
hold
held
held
keep
kept
kept
lay
laid
laid
lead
led
led
lose
lost
lost
make
made
made
meet
met
met
sell
sold
sold
shoot
shot
shot
sit
sat
sat
stand
stood
stood
sweep
swept
swept
teach
taught
taught
tell
told
told
think
thought
thought
win
won
won
ABC型
begin
began
begun
blow
blew
blown
break
broke
broken
choose
chose
chosen
draw
drew
drawn
drive
drove
driven
drink
drank
drunk
fly
flew
flown
forgive
forgave
forgiven
forget
forgot
forgotten
freeze
froze
frozen
give
gave
given
grow
grew
grown
know
knew
known
ride
rode
ridden
rise
rose
risen
ring
rang
rung
shake
shook
shaken
sing
sang
sung
sink
sank
sunk
swim
swam
swum
throw
threw
thrown
write
wrote
written
数学:根号两边平方,哪个大就选哪个,根号6的平方为36,根号7平方为49,因为36比49小,所以根号6小于根号7。
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第1个回答 2019-08-17
例:完成时I
have
finished
my
homework.
被动语态My
homework
have
been
finished.
前者强调主语I,后者强调
homework
,强调的重点不同使得语言表达的效果不一样。要注意两者的结构不一样。
数学题解释:带根号的式子一般都是两边同时平方再比,比如要比较√a与√b,只要a比b大√a就比√b大
have
finished
my
homework.
被动语态My
homework
have
been
finished.
前者强调主语I,后者强调
homework
,强调的重点不同使得语言表达的效果不一样。要注意两者的结构不一样。
数学题解释:带根号的式子一般都是两边同时平方再比,比如要比较√a与√b,只要a比b大√a就比√b大
第2个回答 2019-05-28
完成时是has
done(done是动词过去分词)
被动是be
done,初中的不复杂。根号里面的东西越大当然整个就越大。当然,如果根号在还有负号,那就相反。
done(done是动词过去分词)
被动是be
done,初中的不复杂。根号里面的东西越大当然整个就越大。当然,如果根号在还有负号,那就相反。