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From the first episode of Death Note:

> まったくどうかしてるな 僕も

apparently means

> Seriously, what am I doing?

I was wondering if someone could help me parse this sentence out
grammatically. Things that seem weird to me (as a beginner):

  1. According to the dictionary, "まったく" is apparently an Adverb or a na-adjective. Since there's no な after it, I presume it's an adverb? Yet there's no verb in this sentence either?

  2. The last word is "僕も", which is a noun, correct? Why is there no verb or copular at the end of this sentence?

  3. "どうかしてる" is said to be an expression according to my dictionary. So what function does the な after it serve?
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2022-08-16T02:28:42.450
95835
2022-08-16T18:06:55.473
2022-08-16T18:06:55.473
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question
grammar parsing
Understanding the grammatical structure of 「まったくどうかしてるな 僕も」
* 僕も is at the end of the sentence because it was added as an afterthought. Semantically the sentence is the same as 僕もまったくどうかしてるな.
  * This も is an "exclamatory-も" described in this question: [Odd use of も has me stumped 「ソウルにいるのも今夜きりです」](https://japanese.stackexchange.com/q/32886/5010)
  * どうかしている (literally something like "acting somehow") is a set phrase that euphemistically means "something is wrong (with someone)", "nuts", "insane", etc., depending on the context.
  * This まったく is basically an adverbial intensifier meaning "totally", but it's also used like an interjection. "Seriously" or "Indeed" is a possible translation.
  * な is a sentence-end particle for (self-)confirmation or adding emotion. See: [When is "na" used at the end of a sentence?](https://japanese.stackexchange.com/q/33969/5010) and [Role of な in 嬉しいな](https://japanese.stackexchange.com/q/94197/5010)

So the whole sentence means "Something's totally wrong with me(, huh?)".
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2022-08-16T04:33:55.077
95836
2022-08-16T04:47:12.940
2022-08-16T04:47:12.940
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answer