3.(what if;so what;how come;what for;what about)
(1)
they talked a long time about a painting you weren't that interested in?
(2)—They don't say a single word to each other.
—
?
(3)—Linda didn't invite us to the party.
—
?I don't care.
(4)—Please fetch me a piece of paper,Mary.
—
?
(5)
playing jokes on Li Ming tomorrow?