Question

英语中动词不定式做主语的情况有哪些？

Answer 1

不定式作主语
动词不定式作主语时,句子的谓语动词常用单数,其位置有以下两种:
(1)把不定式置于句首.如:
To
get
there
by
bike
will
take
us
half
an
hour.
(2)用it作形式主语,把真正的主语不定式置于句后,常用于下列句式中.如:
①It+be+名词+to
do
It's
our
duty
to
take
good
care
of
the
old.
②It
takes
sb
+
some
time
+to
do
How
long
did
it
take
you
to
finish
the
work
③It+be+形容词+for
sb
+to
do
It
is
difficult
for
us
to
finish
writing
the
composition
in
a
quarter
of
an
hour.
④It+be+形容词+of
sb
+to
do
It
is
stupid
of
you
to
write
down
everything
the
teacher
says.
⑤It
seems(appears)+形容词+to
do
It
seemed
impossible
to
save
money.
在句型③中,常用表示客观情况的形容词,如:difficult,
easy,
hard,
important,
impossible,
necessary
等;在句型④中,常用careless,
clever,
good,
foolish,
honest,
kind,
lazy,
nice,
right,
silly,
stupid,
wise等
表示赞扬或批评的词.在不定式前的sb,可看作其逻辑主语.这一句式有时相当于Sb
is+形容词+to
do句式
,如:It's
kind
of
you
to
help
me
with
my
English.=You
are
kind
to
help
me
with
my
English.