it is since

Parçacık Önizlemesi:
"It's years since" + simple past / present perfect
20 июл. 2022 г. — Many would not be guided which to use, or which indeed, is the correct usage as well as I am myself. Should it be the past simple or the present perfect? ...

Parçacık Önizlemesi:
Since — English Grammar Today - Cambridge Dictionary
6 дней назад — We use since as a preposition, a conjunction and an adverb to refer to a time, and as a conjunction to introduce a reason.

Parçacık Önizlemesi:
IT'S (BEEN) + DAYS / WEEKS / MONTHS / etc. + SINCE
The structure it's (been) + days / weeks / months / etc. + since is used to emphasise the length of time that has passed since a past event .

Parçacık Önizlemesi:
All about 'Since'
Since can also be used to mean 'as', 'because' or 'given that '. When used this way, it expresses the reason or motivation for something.

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since it's - Translation into Russian - examples English
Translation of "since it's" in Russian ... I always walk up to my friend's house since it's nearby. Я всегда хожу пешком к дому друга, так как это недалеко. ... I ...

Parçacık Önizlemesi:
Why is "since" not correct?
Short answer

Parçacık Önizlemesi:
The Difference between Since and For
We normally use 'since' with the present perfect to describe an action or situation that began in the past and continues in the present . For example

Parçacık Önizlemesi:
It's been...since... / It's...since...
6 июн. 2012 г. — All of your sentences are correct ; native English speakers would quite happily use either construction and none of them would be regarded as wrong.