回答：ahead
of
time；in
advance；ahead
of
schedule；beforehand
等短語，都可表達“提前”之意，請看例句：?
1）ahead
of
time；
例：We
completed
the
work
five
days
ahead
of
time.
我們提前五天完成工作。
2）in
advance；
例：The
booking
office
sells
tickets
3
days
in
advance.
售票處預售3天的票。
3）ahead
of
schedule(=time);
2
例：fulfil
[finish]
the
task
ahead
of
schedule
[=time]?
提前完成任務4）beforehand
(adv.）
They
proposed
to
make
arrangement
beforehand.
他們提議事先做好安排。