整理 A いろいろな働きをする助詞 教科書 p.58
Multi-function auxiliary words
接続：N + も
also / even. Add objects of the same nature or emphasize quantity.
注意 / Note：Check the correct front form, subject and level of politeness; Don't just translate word for word.
比較 / Compare：Compare with structures in the same lesson to choose according to function in the whole sentence. Same 課: 〜こそ／〜でも／〜さえ／〜まで／〜くらい／〜ぐらい／〜など／〜なんか／〜だけ — these models are often mistaken for each other, read the 接続 line carefully and then decide.
私も参加します。
I also participate.
一時間も待ちました。
I waited for an hour.
水も食べ物もありません。
There was neither water nor food.