Which letters represent the rhyme scheme in this portion of the sonnet?

Rhyme schemes are extremely easy if you know what to look for. Now this sonnet must have rhyming words at the end of the sentence. Let me show you this.

I love to sing,

But I was gave a ring,

not to sing

Big and shiny,

From the very king.

So it keeps me from being whiny.

Now Sing and Ring rhyme. So start with A.

Sing rhymes with king so that will be B. And so on.

The Rhyme scheme for the above thing is

A.A.B.C.B.C.

Hope that helps.

the eye wink at the hand; yet let that be / which the eye fears, when it is done, to see.

im not entirely sure what you're asking.