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简单来说就3点。
一、当由陈述句充当宾语从句时,用that引导,that无词义,在口语或非正式文体中常省略。如:
She
said
that
she
would
leave
the
message
on
the
headmaster’s
desk.
He
said
that
he
could
finish
his
work
before
supper.
二、当由一般疑问句充当宾语从句时,用if或whether引导,意为"是否"。如:
Alice
wanted
to
know
if/whether
her
grandmother
liked
the
bag.
I
don’t
know
whether
he’ll
come
the
day
after
tomorrow.
但直接与or
not连用时,往往用whether如:
Let
me
know
whether
he
will
come
or
not.(=
Let
me
know
whether
or
not
he
will
come
)
I
don’t
know
whether
he
does
any
washing
or
not.(=
I
don’t
know
whether
or
not
he
does
any
washing.
)
I
wonder
whether
we
stay
or
whether
we
go.
三、如果宾语从句原来是特殊疑问句,只需用原来的疑问词引导。如:
Could
you
tell
me
where
we
will
have
the
meeting
this
afternoon?
I
don’t
know
who
bought
the
present
for
me.
Is
it
Jack?
一、当由陈述句充当宾语从句时,用that引导,that无词义,在口语或非正式文体中常省略。如:
She
said
that
she
would
leave
the
message
on
the
headmaster’s
desk.
He
said
that
he
could
finish
his
work
before
supper.
二、当由一般疑问句充当宾语从句时,用if或whether引导,意为"是否"。如:
Alice
wanted
to
know
if/whether
her
grandmother
liked
the
bag.
I
don’t
know
whether
he’ll
come
the
day
after
tomorrow.
但直接与or
not连用时,往往用whether如:
Let
me
know
whether
he
will
come
or
not.(=
Let
me
know
whether
or
not
he
will
come
)
I
don’t
know
whether
he
does
any
washing
or
not.(=
I
don’t
know
whether
or
not
he
does
any
washing.
)
I
wonder
whether
we
stay
or
whether
we
go.
三、如果宾语从句原来是特殊疑问句,只需用原来的疑问词引导。如:
Could
you
tell
me
where
we
will
have
the
meeting
this
afternoon?
I
don’t
know
who
bought
the
present
for
me.
Is
it
Jack?
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