Please help me to ask the sentence below properly.
to what word the contraction "d" refers to in "he'd"
Thanks in advance.
I take it you mean
In the contraction he’d, what word does the ’d represent?
I put the written elements you refer to in italics rather than quotes because that is the convention here, and generally in linguistic studies. I also boldfaced these elements, partly to make them stand out and partly because the marks of punctuation in the face employed here are not very legible.
If you are asking that question (and not just how to ask it) ... it varies. It’s always an auxiliary, but which auxiliary is apparent only in context.
I went to find Jim—I hoped he’d tell me where I could find the Blakely file—but he’d already gone.
The first he’d here is parsed he would. It is followed by a ‘plain’ form, here an unmarked infinitive, so the modal auxiliary is required.
The second is parsed he had. It it is followed by the past participle gone, which takes the auxiliaries have and be. Be has no -d forms, so it must be had.
'd
, which is easier to read.