Roleset sweeten.01 Verbnet Class: 1 "make sweet":

Roles:

Arg0:agent, entity causing sweetness


Arg1:thing becoming sweet


Arg2:explicit instrument

Examples:

high-fructose corn syrup (-)
John sweetens his breath with garlic.
Arg0:	John
REL:	sweetens
Arg1:	his breath
Arg2-with:	garlic

Roleset sweeten.02 Verbnet Class: NONE "improve, make more palatable":

Roles:

Arg0:improver


Arg1:thing improved


Arg2:end state


Arg3:start state

Examples:

straight transitive (-)
B.A.T Industries, which is being pursued by Sir James Goldsmith's Hoylake Investments, rose 9 to 753 on speculation that Hoylake will sweeten its bid, dealers said.
Arg0:	Hoylake
ArgM-MOD:	will
REL:	sweeten
Arg1:	its bid




with end state (-)
In August, Temple sweetened the offer to $63 a share, or $963 million.
ArgM-TMP:	In August
Arg0:	Temple
REL:	sweetened
Arg1:	the offer
Arg2-to:	$63 a share, or $963 million




with start state (-)
Vitro S.A., a major Mexican glass maker, said yesterday that it agreed to buy Anchor Glass Container in a tender offer for $21.25 a share, sweetened from the original $20-a-share offer Vitro launched two months ago.
REL:	sweetened
Arg1:	*trace* -> a tender offer for $ 21.25 a share
Arg3-from:	the original $20-a-share offer Vitro launched two months ago

Ignore adjectival usages like "sugar sweetened cereals."