when引导时间状语从句时前后时态要一致吗
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发布时间:2022-05-07 19:07
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时间:2022-07-01 03:42
时间状语从句是指,用表示时间的连词连接一个句子作状语,而形成的复合句。常见的引导词有when,
before,
after,
while,
as
soon
as,
until,
since,但是需要注意一点,如果主句是一般将来时,从句只能用一般现在时表示将来意义。
when引导的时间状语从句的谓语动词用法。when引导的从句的谓语动词,可以是延续性的动词,也可以是瞬时动词。例如:When
I
lived
in
the
countryside,
I
used
to
carry
some
water
for
him.当我住在农村时,我常常为他担水。表示的是延续性的动词。
when引导的时间状语从句与时态的关系。时态要呼应,复合句都要遵循主、从句时态呼应规律,when引导的状语从句也不例外。即主句用现在时,从句也用现在时;主句用过去时,从句也用过去的某种时态。例如:You
must
see
the
doctor
if
you
are
ill.如果你生病了,必须去看医生。主句是一般过去时,从句也要用一般过去时。如:When
he
was
seven
years
old,
he
could
swim.当他七岁时就会游泳。
具体用法。
A.when
分句前面的分句使用过去进行时,例如:
I
was
thinking
of
this
when
I
heard
my
name
called.
我正想着这件事时,突然听到有人叫我。B.when
分句前面的分句使用
was
(were)
about
to,
was
(were)
on
the
point
等。例如:He
was
on
the
point
of
leaving
when
someone
knocked
at
the
door.
他刚要走就有人敲门。C.when
分句之前的分句用过去完成时,其中
sb
had
hardly
/
scarcely
/barely
…
when
已成为固定词组。如:He
had
scarcely
arrived
when
he
had
to
leave
again.
他刚刚到达就又要离开了.