Here is an example making sort of curious things for me
"who are customers with questions advised to speak with"
In the above sentence, what does "with" function at the end of it?
Simply, next to verb 'speak', dose this just work that say something with someone as a verb phrase?
or
assisting 'who' to make sure to represent a meaning who customers should ask their questions to?
and, if it is correct in the second case, is it able to be replaced by other sentences like "with whom are customers with questions advised to speak" or "who are customers with questions advised to speak to" ?
X
is to make speak transitive. Speak is normally an intransitive verb that doesn't take an object, but here one wants to refer to the addressee of the speech. In situations like this (look at, listen to, think about, speak with). English uses prepositions to allow a noun to function as the object of the preposition, and therefore of the verb. Prepositions in English are mostly markers of syntax, not words with regular meanings, like book.