主语从句,即在复合句中充当主语成分的句子,例如"That
he
finished
writing
the
composition
in
such
a
short
time
surprised
us
all",他在很短的时间内写完作文让我们都很惊讶,此复合句主要描述的是某事让我们惊讶,某事就是该复合句的主语,因此"That
he
finished
writing
the
composition
in
such
a
short
time"便是该复合句的主语从句。
引导主语从句的连词主要有:
从属代词:that
whether;
连接代词:who
whoever
whom
whose
what
whatever
which
whichever;
连接副词:when
where
how
why;
主语从句的时态:不受主句的时态影响和限制。
(1)That
he
finished
writing
the
composition
in
such
a
short
time
surprised
us
all.
(2)Whether
we
will
go
for
an
outing
tomorrow
remains
unknown.
(3)Who
will
be
our
monitor
hasn't
been
decided
yet.
(4)Whom
we
must
study
for
is
a
question
of
great
importance.
(5)What
caused
the
accident
remains
unknown.
(6)Whatever
you
did
is
right.
(7)Who
the
watch
belongs
to
is
unknown.
(8)What
we
need
is
time.
(9)What
we
need
are
good
doctors.
小结
(1)引导主语从句连词有that,whether,who,what,whatever等。
(2)连词位于句首不能省略。
(3)主语从句大多数情况下视为第三人称单数,但也有例外,如例(9)。
I
love
you,
because
of
your
porsche.
我爱你,因为你的保时捷。
“我爱你”是主句,从句是辅助主句的原因或形容“因为你的保时捷”。
之所以第一句是主句,是因为我想说的是我爱你。