推荐回答（1个）
right
now,
while,now,
these
days
at
the
moment等词语.现在进行时一般可以从句中找到时间标志词，就必须用现在进行时态来表示。
(1)
现在进行时强调目前正在进行的动作，而一般现在时强调经常性或习惯性的动作。如：
I’m
reading
a
story
now.
我在看一个故事。(目前正在干的事情)
I
read
stories
in
my
spare
time.
我有空时看故事。(经常性的行为)
(2)
现在进行时强调现阶段一直在进行的动作，而一般现在时只表示动作的重复，而不表示动作的持续。如：
What
are
you
doing
these
days?
这几天你在干什么？
They
are
learning
English
in
the
summer
holiday.
他们暑假在学英语。
They
read
English
every
day.
他们每天读英语。
They
play
volleyball
every
Sunday.
他们每周星期天都打排球。
(3)
表示短促动作的动词(如
jump,
knock,
beat,
pick,
skip等)的进行时，表示动作的重复。如：
The
girls
are
jumping
over
there.
女孩子们在那边跳。
His
heart
is
beating
fast.
他的心脏跳得很快。
(4)
某些表示希望或想法的动词(如hope,
wonder,
want等)的进行时可以表示委婉客气。如：
I’m
wondering
whether
you
can
help
us
now.
我不知道你现在能否帮我们一下。
I’m
hoping
that
you
will
succeed.希望你能成功。
答案补充
“在”，“当”，“正好”，“正要”
答案补充
“现在”，“马上”。“立即”，“即时”，“就在……的时候”
答案补充
“正在”，“在做（什么）”，“恰好……时”
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