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A Additional Dataset Statistics
We annotate the hyperbolic spans (Section 3.1) for the 94 real hyperboles in Section 2.3 and show some examples of the most common POS n-grams of hyperbolic spans in Table 7. We further follow Troiano et al. (2018) to annotate the types of exaggeration along three dimensions: "measurable", "possible" and "conventional". A hyperbole is "measurable" if it exaggerates something which is objective and quantifiable. A hyperbole is rated as "possible" if it denotes an extreme but conceivable situation. A hyperbole is judged as "conventional" if it does not express an idea in a creative way. However, we note that there are no absolute answers for these three questions and the annotation results may be subjective. Each hyperbole is either YES or NO for each dimension and the reported numbers in Table 8 are for YES.
B More Generated Examples
Table 9 shows more examples of output generated from different systems and human references.
POS	#	Hyperbole Example
NN	19	His words confirmed everything.
RB	15	He descended endlessly upon the wonders of his trip.
JJ	14	Youth means limitless possibilities.
Table 7: Three most common POS n-grams of hyperbolic spans in 94 randomly sampled hyperboles from HYPO-XL. The hyperbolic spans are in italic.
Type	#	Hyperbole Example
Measurable	44	At any moment, I feared, the boys could snap my body in half with just one concerted shove.
Possible	27	The words caused a shiver to run a fine sharp line through her.
Conventional	65	She is forever picking at the child.
Table 8: Three types of exaggeration in 94 randomly sampled hyperboles from HYPO-XL. The hyperbolic spans are in italic.
System	Sentence	Flu.	Hypo.	Crea.	Rel.
LITERAL	At that point, the presidency was hard to recover.	-	-	-	-
MOVER	At that point the presidency was virtually impossible to recover.	-	-	-	-
R1	The destruction of a President with its collapse of executive authority was too staggering to contemplate.	W	W	T	W
R3	At that point the presidency was staggering to recover.	W	W	L	W
BART	At that point the presidency was too fragile to recover	T	W	T	T
HUMAN	At that point, the presidency was fatally wounded.	T	W	W	W
LITERAL	His piano playing is very bad.	-	-	-	-
MOVER	His piano playing is beyond bad.	-	-	-	-
R1	Her piano playing is absolute magic.	T	T	L	W
R3	His piano guitar is very bad.	T	T	L	L
BART	His piano playing is very good.	T	W	W	W
HUMAN	His piano playing is enough to make Beethoven turn in his grave.	T	L	L	W
LITERAL	The professor humiliated me in front of the class.	-	-	-	-
MOVER	The professor humiliated me in every conceivable way.	-	-	-	-
R1	She infected the whole class with her enthusiasm.	W	W	W	W
R3	That lecture humiliated me in front of the class.	T	W	T	T
BART	The professor humiliated me and the rest of the class.	W	W	W	W
HUMAN	The professor destroyed me in front of the class.	T	L	W	W
LITERAL	It annoys me when you only drink half of the soda.	-	-	-	-
MOVER	It kills me when you only drink half of the soda.	-	-	-	-
R1	That was the best ice-cream soda I ever tasted.	T	W	W	W
R3	It annoys me when you only drink boredom of the soda.	T	W	W	T
BART	It annoys me when you only drink half of it.	W	W	W	W
HUMAN	It drives me crazy when you only drink half of the soda.	T	W	T	T
Table 9: Results of the pairwise evaluation (Win [W], Lose [L], Tie [T]) between MOVER and the outputs generated by the baseline systems. The changed text spans are in italic.