When someone starts speaking to me in English I often want to effectively say
"Japanese is fine".

I usually blurt out 日本語でもいいです which I thought would mean "in Japanese is also
ok" but someone once told me I should say 日本語もいいです "Japanese is also ok".

I interpret the first 日本語で as "in Japanese". A longer sentence might be

> 英語で話しているけど日本語で話してもいいです  
>  you are/I am speaking in English but speaking in Japanese is also ok

which seems like it can be shortened to

> 英語で話しているけど日本語 **でも** いいです  
>  you are/I am speaking in English but in Japaneee is also ok

vs

> 英語で話しているけど日本語 **も** いいです  
>  I am/you are speaking in English but Japanese is also ok

dropping the で just seems to remove the "in" as in the "way" of speaking.

is でも ok here or not?
CC BY-SA 3.0
2017-06-22T04:04:53.597
48635
2017-10-09T10:27:08.023
2017-06-22T04:59:18.880
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question
usage nuances particle-で particle-も
日本語でもいいです vs 日本語もいいです
>   1. 英語で話しているけど日本語 **でも** いいです  
>  vs
>   2. 英語で話しているけど日本語 **も** いいです
>

Only the first phrase is corrent for your intention. The second one means
quite another like: _You are speaking in English but your Japanese is also
good, you can also speak Japanese well or **your Japanese also sounds good_**.

日本語 **も** いいです makes sense somehow, but it is not so natural. We don't use it
to others.
CC BY-SA 3.0
2017-06-22T05:37:13.063
48638
2017-06-22T05:37:13.063
20624
48635
answer