Some time ago, I posted this question on my reply comment and I haven't got the answer so I repost it hoping that I get informed with this problem.

Considering the below example,

e.g. Each of the boys owns a computer.
The boys each own a computer.

As shown by the above example, this operation called quantifier floating could be possible to apply to the infinitive clause, I think.

She wants each of her sons to go to college.
= (1) She wants her sons each to go to college.

So how do you look at the sentence (1)? Is it correct?
1 2
Each of is used before a noun with a determiner(the boys) or a pronoun.Each of can be after object pronouns.
Each of the boys owns a computer.

When "each" refers to a subject,it goes before a verb;when there's an auxiliary,it goes after or between if there are two auxiliaries.

The two sisters each received a new gift.
Each of the two sisters received a new gift.
Your sentences She wants each of her sons to go to college/ She wants her sons each to go to college,are both correct.
Thank you for answering again.
And mind if I ask you what book you refer to? It can be of good use to me, too.
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Hello again,
So sorry because I misunderstood your question;.It's only when I sent you that I noticed that you're asking for "quantifier floating",aren't you ?.
Well,If we have a non-finite form of any verb,each comes before the non-finite (infinitive form of the verb),whenever there's "all",this latter splits the infinitive,but it never goes over the infinitive.However,I have no idea if it's the case of "each".
Examples :
I taught the girls each to play the piano.

I taught the girls to all play the piano.

I taught the girls to each play the piano.(I'm not sure about that).
Your sentence :
She wants her sons each to go to college.correct.
Yes, that is the exact point that I've been confused with.
It is all about the quantifier floating in the case of the infinitive clause.
As far as I've searched, the materials only give the case of 'all' as to floating in its position in the infinitive clause.
As you pointed out below,
everlastinghopeI taught the girls to each play the piano.(I'm not sure about that).
In this position 'all' is suggested to be possible to appear in, whereas there is no information about 'each'.
So this is what made me confused at the very beginning.
And I feel quite relieved from the fact that this problematic structure could arise because even the native speaker doesn't sure of its grammaticality, which means this kind of tricky structure never appears in formal exams nor real conversations.
Though it still remains to be like a conundrum to me.
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Thank you for the linkEmotion: yes
Indeed,all websites talk about "all".I should thank you for tackling this subject;it's really interesting.
I won't stop looking for an answer to your question till I find a suitable information.
I re-asked your question in another way in another post.

see : http://www.EnglishForward.com/English/FloatingQuantifierEachPosition/bbgclr/post.htm

Hope someone will reply and provide us with more information.
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