1、stay
up
doing=
stay
up
and
do(doing
状语,表伴随状况)。继续做之前没有做完的事情
2、stay
up
to
do
=
stay
up
in
order
to
do(to
do
目的状语)。继续做一件事是和之前不一样的事情。
看例句比较：
He
stayed
up
late
yesterday
to
finish
his
assignment.
(
The
reason)
He
stayed
up
late
yesterday
working
on
his
research
(
the
action
taking
place)
标签：stay
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