Recently I came across some lines and could not really understand what the "も"
is doing in them.

Example:

> 私にクラスに鈴木さんという名の生徒が５人[も]{L}いるので驚いた。

vs

> 私にクラスに鈴木さんという名の生徒が５人[が]{L}いるので驚いた。

Thinking about "も" here as "even" or "also" in these examples don't really
make sense to me here and I read in another post that it has a total
affirmation usage but I can't quite grasp it.
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2020-08-19T06:57:58.877
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2020-08-19T15:54:21.217
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question
grammar particle-も
What's the difference between OO人もいる vs OO人がいる?
Your second sentence:

> 私 ~~に~~ **の** クラスに鈴木さんという名の生徒 **が** ５人 **が** いるので驚いた。

is not correct. You don't use two が's that way. You'd instead say:

> 私のクラスに鈴木さんという名の生徒 **が** ５人いるので驚いた。

"Numeral + counter", such as ５人, ２個, ３回 etc., can function adverbially. You'd
use it like this:

> 生徒がいる。 There're students. → 生徒が **５人** いる。 There're five students.  
>  りんごを食べる。 I eat apples. → りんごを **３個** 食べる。 I eat three apples.  
>  山田さんに会った。 I met Yamada-san. → 山田さんに **３回** 会った。 I met Yamada-san three
> times.

* * *

も, used after a numeral and counter, means "as many as" "as much as". You'd
use it this way:

> 生徒が５人 **も** いる。 There're as many as five students.  
>  りんごを３個 **も** 食べる。 I eat as many as three apples.  
>  山田さんに３回 **も** 会った。 I met Yamada-san as many as three times.

So your first sentence:

私のクラスに鈴木さんという名の生徒が５人 **も** いるので驚いた。

means "I was surprised because there were **as many as** five students named
Suzuki in my class."
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2020-08-19T13:39:29.840
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answer