第1个回答 2020-01-25
（2）It
is
true
that
he
has
made
a
very
important
discovery
in
chemistry.
（6）It
is
strange
that
the
man
should
have
stuck
to
his
silly
ideas.
（3）It
is
very
likely
that
they
will
hold
a
meeting;t
be
able
to
go
to
the
south
to
spend
our
summer
vacation。
（1）That
he
finished
writing
the
composition
in
such
a
short
time
surprised
us
all.
（7）Whose
watch
was
lost
is
unknown.
（5）What
caused
the
accident
remains
unknown.
（8）It
is
still
a
mystery
what
caused
the
accident.
（2）Whether
we
will
go
for
an
outing
tomorrow
remains
unknown.
（9）It
is
said
that
he
has
gone
to
shanghai，通常把形式主语it放在主语位置.
（5）It
is
important
that
we
all
should
attend
the
meeting.
（3）Who
will
be
our
monitor
hasn't
been
decided
yet1
主语从句的时态.(=He
seems
to
have
seen
the
film)
（13）It
happened
that
the
two
cheats
were
there.
（12）It
seems
that
he
has
seen
the
film.
（7）It
is
a
pity
that
we
won'.
2
为了防止句子头重脚轻.
（4）
Whom
we
must
study
for
is
a
question
of
great
importance.
（11）It
is
suggested
that
the
work
should
be
done
with
great
care，真正主语搁置于句末
（1）It
is
certain
that
he
will
win
the
match.(=He
is
said
to
have
gone
to
shanghai)
（10）It
is
known
to
all
that
the
gun
powder
was
first
invented
by
the
Chinese.
(=The
two
cheats
happened
to
be
there)
（9）What
we
need
are
good
doctors.
（8）What
we
need
is
time.
（6）Whatever
you
did
is
right：不受主句的时态影响和限制.
（4）It
is
strange
that
he
should
do
that