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I am studying about relative adverbs now and have a question about it.

I learned that 'relative adverbs are where, when and why .' My quesetion is 'Is how also an relative adverb or not?'. If it is, the sentence " I don't know the way how he solved problem." will be all right. Is the sentence correct or not? But, in my grammar book, how is not in the relative pronouns. That means, the above sentence is wrong and I have to correct it into 'I don't know the way he solved problem.' or 'I don't know how he solved problem."

What is correct?

And the second question is, in a dictionary I read that 'the reason why' is redundant. Then do you usually use only 'the reason' or 'why' instead of 'the reason why'?

That is, among the next 3 sentences which one(s) is correct?

a. I don't know the reason why he left so early.

b. I don't know why he left so early.

c. I don't know the reason he left so early.

If all of them are OK, what are the most usual expression?

Thank you for reading!

Thank you!!
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tach[ Exactly how / The exact way / The exact way how ] the ancient Romans dressed in everyday life has long been a topic of discussion for historians.
Which one of these three is the most appropriate?
In my opinion the most appropriate is the first: Exactly how the ancient Romans dressed ....
tachAccording to your discussion, "the exact way how" seems unnatural in terms of redundancy, but I see on the Web more than one hundred thousand uses of it as a set phrase.
Ignore what you've seen on the Web. Don't use "way how".

CJ
Comments  
How is an adverb used as a relative subordinator, along with where and when. Who and which are pronouns that can have the same function in a sentence. These are correct:

I don't know how he solved it.
I don't remember where he went.
I don't know when I'll be home.
I don't know the way (that) he solved it.
I don't know (the man) who solved it.

a. I don't know the reason why he left so early.
b. I don't know why he left so early.
c. I don't know the reason (that) he left so early.
These are all correct. Reason why seems redundant to many (the reason = why, as can be seen by the correctness of B and C); though it is in frequent use, careful writers avoid it.
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Do you mean "I don't know the way how he solved it." is correct? ( I should have checked it earlier. Hope you see this and reply to me. Thank you.)
These are correct:

I don't know how he solved it.
I don't remember where he went.
I don't know when I'll be home.
I don't know the way (that) he solved it.
I don't know (the man) who solved it.


I have a problem regarding this point.

A Japanese college entrance exam asked the following question:

[ Exactly how / The exact way / The exact way how ] the ancient Romans dressed in everyday life has long been a topic of discussion for historians.

Which one of these three is the most appropriate?

According to your discussion, "the exact way how" seems unnatural in terms of redundancy, but I see on the Web more than one hundred thousand uses of it as a set phrase.

Could someone give me any suggestion? Thank you.
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Jisu98That is, among the next 3 sentences which one(s) is correct?
a. I don't know the reason why he left so early.
b. I don't know why he left so early.
c. I don't know the reason he left so early.
If all of them are OK, what are the most usual expression?

Unfortunately, the most usual expression (a) is the least correct. Both (b) and (c) are better. (b) flows the best.
 CalifJim's reply was promoted to an answer.
Thank you for your comment, CJ. Now I can avoid "way how" with a great amount of confidence, no matter how many people use it on the Web.
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