>>>>>>I wouldn't be surprised if it's the most commonly misspelled common word in the English language.
>>>>>
>>>>>My vote would be for the use of the contraction "it's" when the possessive "its" is meant.
>>>>>
>>>>>It's amazing how often that mistake occurs even in ad copy from some fairly large companies. I'm beginning to think it may become a de facto change to the English language, partly because that usage is actually more consistent with other possessive forms ("Al's", "Tamar's" etc.)
>>>>
>>>>FWIW, I used to have to stop and think every time I wrote "it's" or "its" to figure out whether I needed the apostrophe. Finally, I realized that the possessive "its" follows the model of "his" and "hers." Never had the problem since.
>>>>
>>>>Tamar
>>>
>>>Another easy rule is that the only time to use "it's" is when you are contracting "it is".
>>
>>How about "it has" then?
>
>Is that allowed?

Certainly!

Q-"Where's the dog been?"
A-"He's been in the garden" (cf "I've been in the garden")

"Your son's been arrested" Extremely common - more so than "He has been ..." (Which is how it was in the 19th century - no contractions).