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PRESENT SIMPLE (usually, often, every day[ year])
1: - to talk about what people do all the time, or again and again.
I speak English.
2: - to talk about things which are always true. (stating fact)
Water boils at 100° C.
3: - to talk about situations which are permanent (continuing for a long time).
Mr. Smith lives in London. (that is his permanent home.)
PRESENT PERFECT (already, yet, just, never, since, ever, recently, lately)
1: - to talk about something which started in the past and continues up to the present.
She has worked in Canton for six months. ( = She still works in Canton now.)
He has lived in this house since 1931.
2: - for things which have happened during a period of time that continues up to the present.
Have you ever eaten Japanese food? ( = in your life up to now)
3: - to talk about an action in the past which has an effect or result in the present.
The taxi has arrived. (the taxi is now here.)
4: - with yet (adverb) in questions, if you want to know if something you are expecting has, or has not, happened.
Has the postman come yet ?
5:- - with never in negative sentences.
I have never seen a ghost.
6: - with already when something has happened sooner than expected:
I have already eaten.
7: - with just (adverb) when you talk about something that happened a very short time ago.
They have just come back from holiday.
8: - with a period of time which has not yet finished, like today, this week, this month, this year.
We have only had two customers all evening.
9: - with “recently” and “lately” when you talk about something which happened not long ago or to ‘announce ‘news’.
The weather has been terrible lately.
I have not worn these trousers recently.
PRESENT CONTINUOUS TENSE, PAST TENSE and FUTURE: Email to you, run out of space.
To 回答者:Ling:
We go to school by bus every day. (“every” and “day” should be two separate words. Everyday is an adjective.)
2011-01-09 11:03:19 補充:
To:宜
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參考: Grammar Spectrum - M. Harrison