Ingles

.Using “For” and “Since” in Present Perfect.
Concept:
We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT usethe Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc. We CAN use the PresentPerfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, etc.
Use:
We often use for and since with the present perfect tense.
*We use for to talk about a period of time - 5 minutes, 2 weeks, 6 years.
* We use since to talk about a point in past time - 9 o'clock, 1st January, Monday
Here are some examples:
* I havebeen here for 20 minutes.
* I have been here since 9 o'clock.
* John hasn't called for 6 months.
* John hasn't called since February.
* He has worked in New York for a long time.
* Hehas worked in New York since he left school.

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Adverbs in Present Perfect
Ever:
* in questions. e.g. 

Have you ever been to England?
Has she ever met the Prime Minister?
* innegative questions e.g.

Haven't they ever been to Europe?
Haven't you ever eaten Chinese food?
* in negative statements using the pattern nothing.......ever, nobody.......ever e.g.Nobody has ever said that to me before.
Nothing like this has ever happened to us.
* 'Ever' is also used with 'The first time.... e.g.

It's the first time (that) I've ever eaten snails. 
This is the firsttime I've ever been to England.

Never:
You must not use never and not together:
* I haven't never been to Italy.
* I have never been to Italy
Position:
Ever and never are always placedbefore the main verb (past participle).

Alrready:
Refers to an action that has happened at an unspecified time before now. It suggests that there is no need for repetition, e.g.
* I’ve...