Meaning of も vs でも for "even"


I'm wondering about the difference between も and でも for their "even" meaning.

Using example sentences from A Dictionary of Basic Japanese Grammar,

> 私は難しい仕事 **でも** する。(original, pg 112)
>
> 私は難しい仕事 **も** する。(swapped for も)

and

> 私はこんな難しい漢字 **も** 読める。(original, pg 250)
>
> 私はこんな難しい漢字 **でも** 読める。(swapped for でも)

Are the swapped sentences grammatically correct? If so, is there a difference
in nuance?




There is a difference in nuance. でも implies that **"normally it isn't but in
this case it is"**.

> 私は難しい仕事 **でも** する。

This implies that 通常私は簡単な仕事しかしないが・・・実は難しい仕事でもするよ。(I normally do only easy
jobs, but actually I can also do difficult ones.)

> 私は難しい仕事 **も** する。

This implies that the person speaking normally does easy, (moderate), and
difficult jobs. No emphasis is given that s/he "can also" do difficult jobs.
S/he has always done them too.

Let's use another example:

> この映画は小さな子ども **でも** 楽しめる。

Movies like this are **normally perceived to be only enjoyable for a certain
age group** , e.g. teens and above. However, **this particular one is actually
enjoyable also for little kids** , like toddlers, pre-schoolers, grade school
kids, etc.

> この映画は小さな子ども **も** 楽しめる。

This movie is enjoyable also for little kids, and nothing is special about it.
It has always been like that.

