And you, Helen
And you, Helen, what should I give you?
So many things I would give you
Had I an infinite great store
Offered me and I stood before
At this stage it is not clear whether Helen is a listener or if Thomas is writing this as an abstract exercise, expressing feelings he found difficult to convey to her face-to-face. He clearly doesn’t expect an answer, so the question may be  rhetorical , something he is asking himself rather than his wife. However, the repetition of “you” — it appears three times in two lines — indicate the focus of his purpose. 
 A key word, “should” is the first of the conditionals that establish the essence of the poem. Following are “would”, “could” and the questionning tone that indicates Thomas would like to give but is unable to.
And you Helen