も meaning in もう八日*も*何も食べていないんです。


Here is the full sentence:

> すみませんが、水を下さいませんか。  
>  もう八日も何も食べていないんです。

I am still at the beginner level. From my understanding:

**もう** means already  
**も** means also

Why add も after the もう八日?




It is an emphasis (cf.
[も](https://dictionary.goo.ne.jp/word/en/%E3%82%82/#je-75042) #5), and add _as
many as_ in the example. As such, も can be dropped but perhaps it is better to
add 間 (八日間{ようかかん}) to make it work adverbially.

Another example:

  * 日本に来てもう10年経った 10 years have passed since I came to Japan
  * 日本に来てもう10年も経った As many as 10 years have passed since I came to Japan




It is an emphasis (cf.
[も](https://dictionary.goo.ne.jp/word/en/%E3%82%82/#je-75042) #5), and add _as
many as_ in the example. As such, も can be dropped but perhaps it is better to
add 間 (八日間{ようかかん}) to make it work adverbially.

Another example:

  * 日本に来てもう10年経った 10 years have passed since I came to Japan
  * 日本に来てもう10年も経った As many as 10 years have passed since I came to Japan

