Usage of some/any (Some person will have to pay for that; etc.)

[Pedro8686]

Hello. Could you please check if (the?) below examples are correct or would be correct in some particular circumstances? Sorry for such a long post but I wanted to give enough examples to make it clearer. Thanks a lot for your help!

1) Some person will have to pay for that.

2) Is there some person who will pay for that?
I suppose, this one could be correct only if we are expecting that there is such person.

3) -Is there some pen?
-No, there isn't any.

4) Is there some pen on the table?

5) Is there any pen on the table?

6) Are there any pens on the table?

And another example:

7) Touching someone's hair.
-What is this?
-It's the hair.


8 ) Touching one hair.
-What is this?
-It's a hair.

9)
-Is there any hair on the table?
- No, there isn't any.

10) One suppouses there can be a lot of hair on the table.
-Are there any hair on the table?
-There aren't any.

11) One suppouses there can be several hairs on the table.
-Are there any hairs on the table?
-There aren't any.

I read somewhere that any can be used before a singular countable noun with the meaning of `it doesn't matter who/which/what`
OR when it means `an unspecified or unknown`

[Mister Micawber]

.
1) Some person will have to pay for that.-- OK

2) Is there some person who will pay for that?-- OK
I suppose, this one could be correct only if we are expecting that there is such person.-- It is not so strict.

3) -Is there some pen?-- No. Are there some pens?
-No, there aren't any.

4) Is there some pen on the table?-- No. Are there some pens?

5) Is there any pen on the table? -- No. Is there a pen?

6) Are there any pens on the table?-- Yes

7) Touching someone's hair.
-What is this?
-It's hair.

8 ) Touching one hair.
-What is this?
-It's a hair.-- OK

9)
-Is there any hair on the table?
- No, there isn't any.-- OK

10) One supposes there can be a lot of hair on the table.
- Is there any hair on the table?
-There isn't any.

11) One supposes there can be several hairs on the table.
-Are there any hairs on the table?
-There aren't any.-- OK
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Native English teacher at Mister Micawber's

[Pedro8686]

Thank you for your answer

[Mister Micawber]

.
2-- Is there some person in the world who can dance on the head of a pin?

7-- No, no- the owner of the hair is irrelevant to this grammar.
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_________________
Native English teacher at Mister Micawber's

[Pedro8686]

How should I say when showing other parts of the body?
E.g.
-It's the back OR It's the face (because they are single parts of the body)
and
-It's an eye OR It's a finger OR It's a thumb (because they are double or more)

Is that right?

And while 'hair' is uncountable (when we show it on the body and we don't have only several hairs) we say "It's hair".
But when we would show some particular hair, for example the Elvis Presley's hair we would say "It's the hair of Elvis Presley"

Am I correct now?

[Mister Micawber]

.
-It's the back, It's the face (because they are single parts of the body)
-It's an eye, It's a finger, It's a thumb (because they are double or more)

Is that right?-- These are right (and for the rules you state) in these isolated sentences, and relating only to the usage of 'a'/'an' vs 'the'. What is not considered is that in context there are probably better choices: This is my back/eye, That's his face/thumb,etc.

And while 'hair' is uncountable (when we show it on the body and we don't have only several hairs) we say "It's hair". But when we would show some particular hair, for example the Elvis Presley's hair we would say "It's the hair of Elvis Presley"-- Yes, but 'hair' is still uncountable..
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_________________
Native English teacher at Mister Micawber's