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As to topic-comment, this terminology appears in some writing manuals
with reference to structures such as "My father, he seldom votes". They
are labeled outright ungrammatical, which I find a little extreme. I
view the Beowulf example as similar. Topic-comment syntax is standard
in some languages. A rough example I recall from my
structure-of-Chinese course is "Elephant, nose is long", which would be
translated as "Elephants have long noses". I can imagine a novice
writer writing something like "As far as elephants, they have long
noses".
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