simple present tense
keywords:always,often,sometimes,regularly,seldom,usually,every,daily,nightly,weekly,monthly,generally,
on(Mondays.....)(today)(now),
in the(mornings,afternoons,evenings),
once/twice/thrice(a day,a week,a month,a year)
general truth
ag)
they eat she eats
they don't eat she doesn't eat
do they eat? does she eat?
passive voice:is/am/are + eaten(The food is eaten by Ali)
simple past
keywords:yesterday,last,ago,just now,this morning,once,previous(ly),it is time
eg)
they/she ate
they/she did not eat
did they/she eat?
passive voice:was/were + eaten
simple future
keywords:tomorrow,tonight,(today),next,soon,
this(Sunday,afternoon,week....)
in(4yrs,3mins.......)
in the coming(yrs,weeks....)
(6 days,2 weeks.....)from now
at the end of the (yr,day.....)
in future,hope,afterwads,later
eg)
they/she will eat
they/she will not eat
will they eat?
passive voice:will/shall + be + eaten
present continuous tense
keywords:at the moment,at present,look,listen,(still),(while),(when),(as)
ag)hurry up,the bus is coming!
they are eating
she is eating
they are not eating
she is not eating
are they eating
is she eating
passive voice:is/am/are + being+ eaten
past continuous tense
keywords:
all,whole,entire,through,throughout,at the/this/tat time,at 2 o'clock
+
yesterday,ago,last,this morning
(still)(while)(when)(as)
eg)
1。condition:it is used to show an action that was continuing in the past
->I was reading a book throughout yesterday morning.
2。it is used to show an action that was continuing when another action interrupted
->They were talking when the teacher walked in.(先发生的用p.c后来发生用s.p)
(past continuiuous) (simple past)
3。It is used to show two actions that were happening at the same time.
->We were studying while he was sleeping (同时都在进行)
they were eating
she was eating
they were not eating
she was not eating
were they eating?
was she eating?
passive voice:was/were+being+eaten
future continuous tense
keywords:
at the/this/tat time,at 2 o'clock,all,whole,entire,through,throughout
+
tonight,today,tomorrow,next,this Sunday
eg)
condition t is used to show an action that will be continuing in the future.The emphasis is on the continuous action
->They will be watching show a this time tomorrow.
they/she will be eating
will they/she be eating
they/she will not be eating
no passive voice
present perfect tense
keywords:since,ever,yet,recently,until now,up to the present,so far,(already),(never),(for),(after),(just),(when)
ag)
1)It is used to show an action that has just been completed
->I have just taken my dinner
2)It is used to show an action that happened and finished in the past but the exact time is not mentioned.
->she has bought a pen
3)It is used to show an action that has started and is still continuing
->He has studied for six hours(He is still studying)
No time expression:He has gone out.
they have eaten
she has eaten
they have not eaten
she has not eaten
have they eaten?
has she eaten?
passive voice:has/have +been +eaten
present perfect continuous tense
eg)it is used to show an action that bagan in the past and is still continuing.The amphasis is in the continuing action.
He has been studying for six hours(He is still studying.)
He hae been reading it since this morning(He is still reading it)
same time expressions as present perfert tense
they have been eating
she has been eating
have they been eating
has she been eating
they haven't been eating
she hasn't been eating
no passive voice
past perfect tense
keywords:if only,i wish,by(yesterday,last yr....)(already),(never),(for),(after),(just),(when)
eg)
1.It is used to show an action that happened b4 another action in the past.
->She had eaten her dinner by the time he arrived
(past perfert) (b4) (s.past)
2.It is used to show an unfulfilled action.
->I wish I had arrived earlier.
they/she had eaten
they/she had not eaten
had they/she eaten?
passive voice:had+been+eaten
past perfect continuous tense
It is used to show a repeated or continuing action that happened b4 another action in the past.The emphasis is on the continuous action.
she had been eating for ten minutes b4 he arrived.
same time expressions as past perfect tense
they/she had been eating
they/she hadn't been eating
had they/she been eating?
no passive voice
future perfect tense
keywords:by(tomoro ,next week.....)
eg)It is used to show an action that will be completed by a given time in future
The show will have ended by the time you arrive
（future perfect）(b4) (s.present)
He will have eaten his lunch by 2 o'clock this afternoon
they/she will have eaten
will they/she have eaten?
they/she will not have eaten
passive voice:will/shall+have+been+eaten
conditional tenses
1)likely condition
a)He will/may/can do it if you ask him
(s.present)
b)Tell him about it if he comes
(infinitive) (s.present)
2)unlikely condition
a)He would/might/could do it if you asked him
(s.past)
b)I would/might/could do it if I were you.（不管是I,you we they he she it后面都用were）
(s.past)
3)Impossible condition
He would/might/could have done it if you had asked him
(past perfect)
[ 本帖最后由 akaki 于 5-11-2008 10:59 PM 编辑 ] |
发表于 5-10-2008 12:26 AM
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