英文grammer

PRESENT SIMPLE TENSE (usually, often, every day[month, 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 CONTINUOUS TENSE (now, at the moment, Look!)

1: - for things that are happening now, at this moment or for a short time.
He is coming now.

2: - to talk about something which is progress around the present, but not necessarily exactly at the moment of speaking.
Susan is looking for a job at the moment.

PRESENT PERFECT TENSE (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 Toronto for six months. ( = She still works in Toronto 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.

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Simple past…………..yesterday, last week, last month…Present perfect…….since, for, yet, already, just…
Past perfect……………………when, before, after……(only something happened in the past)