It's, the last contraction is it's, it's, so similar to he's and she's which we talked about before. It's with the apostrophe s here I should note can refer to it is or it has.
Even the exclamation point was left off of early models, assuming that users could type a period, then backspace and add an apostrophe to make a close approximation.
The apostrophe is not used to show there is more than one, it's used to show there is a missing letter or that the word is a possessive, it's just wrong!
This construction with of is very common in languages like German but in English, it is much more common to use that possessive apostrophe S when we're talking about people and use of when we're talking about things.
这个带 of 的结构在德语等语言中很常见,但是在英语中,当我们谈论人时,所有格撇 S 更常见,当我们谈论事物时,使用 of 更常见。
The use of the apostrophe in possessives is probably due to the fact that in Old English, many possessive nouns were formed by adding " es" , as in the king is thrown.
撇用于所有格,其起源可能与古英语的习惯有关:当时许多所有格名词是通过在词尾加 “es” 构成的,比如 “the kinges throne”。
He said that until the 17th or 18th century, the possessive of proper names ending in the letter " s" — such as Jesus or Moses — often was simply the name itself with no apostrophe or additional " s."
In the other sentence he's been on the phone all day, we see the past participle form of be, been, he has been. So we understand the s apostrophe s is actually has there not is.
在另一句he's been on the phone all day中,我们看到了be的过去分词形式been。所以我们明白撇s实际上是has而不是is。