I would say when he goes back to check on her to realize she has hung herself? You didn't post any options... So that is the best thing I have got.
Lines 4, 7, 8, and 9 <span>are all examples of figurative language in the poem. Realistic themes for this poem: lies, depression, pain, hurt. A life lesson for this poem could be that it is not always good to hide our feelings because they may overcome us one day.
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I think Mary and Colin´s transformation is gradual. Mary and Colin both become different people. Mary grows up and is less spoiled, and Colin outgrows his mean ways when he goes outside and sees the secret garden realizing he wasn´t injured as previously thought. As for evidence I am currently re-reading the book now.