什么情况下宾语从句的引导词 可做宾语从句的主语

Question

如题所述

Answer 1

只有特殊疑问代词what,
which,
who
引导宾语从句的同时可以做从句的主语。如：
I
don't
know
what
should
be
done.
Can
you
tell
me
which
is
right?
He
told
me
whom
had
come
to
the
office.
这些宾语从句有时可以转换成疑问词+不定式：
I
don't
know
what
to
be
done.
不过，当疑问代词在宾语从句中作宾语时，都可以转换成"疑问词+不定式“。如：
I
don't
know
whom
I
should
ask.=
I
don't
know
whom
to
ask.
Can
you
tell
me
which
I
should
choose?
=
Can
you
tell
me
which
to
choose?