لو since محيراك تعالى هنا

[ابو بيشو]

In the tapescript, Sec 2 TG page 318 review F, you wrote "It's years since we've been to England." Why did you use the present perfect after "since"? We teach students that we use the past simple in the clause that comes after "since". Please explain. Also what does the apostrophe "'s" in "it's" refer to? Is it "is" or "has".
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Since does not have to be followed by the simple past. In a sentence such as It’s a long time/years since … , it is very natural to use the present perfect if the action is repeatable. The simple past is also possible.
(a) It’s years since we’ve been to England.
(b) It’s years since we were in England.
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Both sentences speak of repeatable actions. Sentence (a) implies that the speaker was in England more than once in the past. Sentence (b) implies that the speaker was there only once in the past.

When the action is not repeatable, the simple past is used.

(c) It’s ten years since we cut down the elm tree.

The present perfect is also often used when the verb has duration.

(d) It’s ten years since we’ve known John.

In these sentences It’s means It is. If the sentences were It’s been years, It’s would mean It has.

[ابو بيشو]

I went to Luxor a week ago
Now , I'm in Qena.
Use:since/been/It is