Read this poem: how like a winter hath my absence been from thee, the pleasure of the fleeting year! What freezing have I felt, what dark days seen! What old becember's bareness every where! And yet this time removed was summer's time; The teeming autumn, big with rich increases, bearing the wanton burden of the prime, like widow'd wombs after their lord's decease: yet this abundant issue seem'd to me but hope of orphans and unfather'd fruit; for summer and his pleasures wait on thee, and, thou away, the very birds are mute; or, if they sing, 'its with so dull a cheer that leaves look pale, dreading the winter's near. Where does the tone shift in the poem.