In the poem "Dover Beach" what is this poem's rhyme theme?

Question

Can you please show it to me?

What does it tell you? 

I know Arnold only uses rhyme for special emphasis and I need to pay special attention to the last four lines of the poem but it is still seems to be over my head.

Answer 1

Do you mean rhyme scheme, rather than theme?  The last 4 lines seem to be:

Nor certitude, nor peace, nor help for pain;

And we are here as on a darkling plain

Swept with confused alarms of struggle and flight,

Where ignorant armies clash by night.

The rhyme scheme there would be A-A-B-B (because the first two lines rhyme, and the second two rhyme) -- but the rhyme scheme throughout the whole poem is more complicated than that.