The answers to the extract are:

• i. The word "Perhaps" in the second line introduces an element of uncertainty. It suggests that the speaker is not entirely sure about the reason behind the solitary reaper's song. The speaker is analyzing the possible content of the song, but there's an acknowledgment that they don't have definite knowledge. It leaves room for interpretation and allows the reader to imagine various scenarios.
• ii. The quality of the solitary reaper's song expressed here is one of melancholy and nostalgia. The word plaintive in the second line indicates a sense of sadness or sorrow. The song is associated with old unhappy, far-off things and battles long ago, which implies a sense of longing for the past.
• iii. Yes, the Reaper's song conveys a sense of yearning and longing for something. The mention of old unhappy, far-off things and battles long ago suggests that the reaper's song is a reflection of past events that hold emotional significance. This yearning might be for a time that has passed, for memories, or for a connection to the past.
• iv. In this case, the word plaintive from the second line can be used as a replacement for doleful. So the sentence would be: "His face is long and can look plaintive when he is not smiling."

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