doesn't,didn't,don't怎么区分?

hychai

doesn't,didn't,don't怎么区分？
常常会搞乱掉，到底怎么用这些辞才对呢？
可以告诉我吗？或是给example吗？
谢谢大家！

darksider

Present simple
He  ]    ]     ]
She ] is ] has ]  singular verb(verb + s)
It  ]    ]     ]
         
I   ] am  ]       ]
You ]     ]  have ] plural verb ( base form,verb only)
We  ] are ]       ]
They]     ]       ]

Eg.
He eats the cake.(The verb is singular verb.)
I start the lesson.(The verb is plural verb.)

Do(base form),Does(Singular form)-Present simple
Did(Past form)-Past simple

When do we use does not and when do we use doesn't(contraction and also called abbreviation)?
We use does not when we write formal essay,be it an article,argumentative essay,factual essay or narration.

We use abbreviation when we write informal essay,eg informal letter and also it is used in direct speech.Such as "You just don't understand when your uncle has been doing these few days."He reiterated.

Do you need help?(in present,you are asking people about the present.)
Did you hear what i said just now?(You're asking people about the past.)
Doesn't she finish your homework?


Another example
She plays game.=She does play game.(note:plays=does play)
(if you write she does plays game,it becomes she does does play games,it is a redundency,very ridiculous mistake.)
The two sentences above are positive statements.
However,when you want to form a negative statement of them,there is only one way and it is very simple.
-She does not play game.
When you want to form a negative question of it,does not is put before the subject,and the verb is always after the subject.
Does not she play game?

You use present simple to talk about present.
There are many functions of present simple,you may search it on the net,i cannot explain everything to you.However,there is function of it which is very general.
When do we use present simple?
We use present simple to talk about habitual action.
eg,i drink coffee everyday.
   I cycle to school every morning.
   I go to tuition every tuesday night.
   
I will explain to you when i am free and fresh enough,you may search the thread i have created,i have written some grammar rules in this forum.

There is also a particular thread which is opened to help people in grammar,look for it.

rioj

原帖由 hychai 于 3-8-2007 09:24 PM 发表
doesn't,didn't,don't怎么区分？
常常会搞乱掉，到底怎么用这些辞才对呢？
可以告诉我吗？或是给example吗？
谢谢大家！

Present Form-  Singular 3rd person (e.g. He, She, It) Does/ Doesn't
               Plural or 1st/2nd person (e.g. They, I, You) Do/Don't

Example:      She doesn't need any more tuition in English
              He does need some good lecturing on not to speak loudly in public.
              It doesn't need a smart person to figure that project doesn't work.
              They don't want to have dinner there.
              I don't think he's coming to this meeting.
              You don't have to tell me what to do, do you?


Past Form  （过去式） - All use did/didn't.
              She didn't need any more tuition in English when she passed the subject in SPM with flying colours.
              He actually didn't do that artwork by himself as was initially thought.
              It didn't matter at that time that I needed the money.
              I didn't think his prediction would come true, I was wrong.
              You didn't just do that for fun, did you?- Example X

The verbs after did/didn't, does/doesn't, do/don't or has/hasn't, have/haven't, had/hadn't, take on the root/base form, like example X above.

[ 本帖最后由 rioj 于 2-9-2007 11:04 PM 编辑 ]