Marvell actually directly provides the answers to these questions in his poem: it can be divided into "if," "then," "but," and "therefore" sections, except that he has used different words to introduce some of them.
The first line of the poem, "Had we but world enough and time," is the "if" section. This could be rephrased as, "If we had all the time in the world and all the possible opportunity."
He follows this up with the "then" response: "This coyness, lady, were no crime." So, Marvell is saying, if we had all the time in the world, then it wouldn't matter that you, the mistress, are being so coy and refusing to advance beyond the courtship stage.
For several lines, Marvell describes what he would do if this were the case. However, then he brings up the "but" issue: "But at my back I always hear / Time's winged chariot hurrying near."
Here, then, the poet is saying that he wishes they did have all the time in the world, but he's very conscious that they don't and that soon enough, he and his...
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