New answers tagged adverbs
1
「本当{ほんとう}に正直{しょうじき}に話{はな}していいかな？」
is 100% grammatical and natural-sounding. Both 「本当に」 and 「正直に」 function adverbially.
Having never studied Japanese as a foreign language, however, I do not know if 「本当に」 and 「正直に」 are actually called "adverbs" outside of Japan. In Japan, those are called 形容動詞{けいようどうし} ("na-adjectives") in their 連用形{れんようけい} ("continuative ...
1
Yes, the conjugation rule is consistent with all the い-adjectives.
There are a few notable exceptional cases where they can also syntactically be nouns:
近い→近く:
adjectival: 近くのX - the nearby X
noun: Xの近く - the vicinity of X
多い→多く:
adjectival: 多くのX
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