Answer:
A couplet consists of four rhyming lines.
Explanation:
If a source is correct and trustworthy then it is credible, which means that you can use it in official research as a valid source without having your work discredited. This means that it is usable, and has a merit, and you can use it without being afraid of plagiarism or something else.
The reader's moody and anxious tone emphasized the Gothic themes in the poem.
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