Hi; Welcome to the Forums. " are both OK. " But for writing, it is different: I am writing a book in English.
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MichaelMMIs it proper to say, "I am speaking --in-- English." [Y]c45
"in" is not needed and makes the sentence sound a bit odd.
AlpheccaStarsBut for writing, it is different:
I am writing a book in English.
Sometimes you have to use "in English" with "writing", as in the above sentence. If you immediately follow "writing" with a direct object, you usually have to use "in English".
I am writing (a letter)(some sentences)(my report)(the instructions) in English'.