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William Shakespeare is comparing "thee" to a "gold complexion dimmed" so he is comparing her to gold.

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Shakespeare is comparing her to a summers day and explains how she is more beautiful than a summers day. An example of this is "thou art more lovely and temperate". Shakespeare is explaining how lovely she is.

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William Shakespeare is comparing "thee" to the "darling buds of May: so he is saying that she is a beautiful flower and is a darling

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The speaker is comparing his girl to summer. "But thy eternal summer shall not fade" The speaker is saying her memory will not fade or her beauty will not fade. He is comparing her beauty to the summer and the sun in the fact that she is hotter than the sun.

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he doesn't explain the same things, he gives different reasons as to why he should compare thee to a summer day. he says "sometimes too hot the eye of heaven shines." maybe he is comparing her beauty to the summer.

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"But thy eternal summer shall not fade"
He is saying that her beauty will not fade or go away