1.
强调两方面的选择，特别是句中有or
not时。如：
Let
me
know
whether
you
can
come
or
not.
2.
宾语从句前置时。如：
Whether
this
is
true,
I
can't
say.
3.
引导主语、表语、同位语从句时。如：
Whether
the
football
game
will
be
played
depends
on
the
weather.
（主语从句）
The
question
is
whether
he
can
do
it.
（表语从句）
The
question
whether
we
should
go
with
them
must
be
decided
at
once.
（同位语从句）
4.
在介词之后作介词的宾语时。如：
I
haven't
settled
the
question
of
whether
I'll
go
back
home.
5.
在不定式前与不定式一起组成词组时。如：
Whether
to
go
or
stay
is
still
a
question.
6.
在discuss,
decide
等动词后作宾语时。如：\
We
discussed
whether
we
should
go
there
by
plane.
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