在英语上的时间点和时间段

Question

如题所述

Answer 1

for:
(prep)
表示时间的持续，后面加时间段，表示一段时间，多与带数词的名词连用，其谓语需用延续性动词。
We
have
been
leaning
English
for
two
years.
since:
(prep)
表示“自从过去某一时间点以来”，后面接点时间，强调动作或状态一直延续到现在，一般用现在完成时或现在完成进行时。
I
have
been
skating
since
9
o’clock.
How
long
have
you
been
doing
that?
Since
2
years.
I
have
been
collecting
kites
for
seven
years.
He
has
been
watching
English
movies
since
9
p.m.
I
have
been
listening
to
music
videos
since
1999.

Answer 2

时间点就是一个时间，比如since
1998,就是自从1998年
而时间段就是一段时间，比如he
has
been
finished
his
homework
for
3
hours.他用了三个小时完成作业。