Hello asungilsanz,
I agree with Bruce, totally!
…
How I teach the APOSTROPHE.
In English, we often introduce a person, a thing, a situation, or an activity into a conversation.
For example, “Peter and his hat”.
After this, we want to speak directly and briefly about it. We don’t want to waste time using lots of words.
“There is something that I would like to tell you about the person called Peter and the thing that he wears on his head … his hat”
No!
For this we use an apostrophe …’
We say: “Peter’s hat.”
This means: “The hat of Peter.”
“Peter’s hat is blue.” = “The hat of Peter is blue”
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1) “The student’s book is good.” = “The book of the student is good.”
2) “The student’s books are good.” = “The books of the student are good.”
3) “The students’ book is good.” = “The book of the students is good.”
4) “The students’ books are good.” = “The books of the students are good.”
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“London’s Festival is much larger than Manchester’s.” = “The festival of London, that we are discussing, is much larger than the festival of Manchester, that we are discussing.”
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christinasuma.
Again, I agree with Bruce. No, we don’t say, “The country language”.
We say, “The country’s language”. = "The language of the country that we are discussing."
“Different countries have different languages, often because of their history. England’s language is English, France’s language is French, and Holland’s language is Dutch.”
I hope that this helps you.
Les Douglas