第1个回答 2019-02-07
have
to表示客观需要做的事情,意思是“必须”、“不得不”.后跟动词原形,有人称、
时态和数的变化,与情态动词
must
近义.
一、
have
to
的陈述句形式
A、
肯定式：have
to
+
动词原形
1、
I
have
to
tidy
my
room.我得整理房间.
2、
She
has
to
help
with
the
washing.她得帮忙洗衣服.
B、
否定式：don't
(doesn't)
+
haveto
+
动词原形
1、You
don't
have
to
go
if
you
don't
want
to.如果你不想去,你就不必去.
2、He
doesn't
have
to
stay
at
home
all
day.他不必整天呆在家里.
二、have
to
的一般疑问句形式及简略答语
have
to的一般疑问形式必须借助助动词
do
或
does：
1、
Do
you
have
to
look
after
your
sister?你得照看你妹妹么?
Yes,I
do./
No,I
don't.是的,我得照看./不,我不必照看.
2、
Does
Jim
have
to
do
his
homework?吉姆必须做家庭作业么?
Yes,he
does./
No,he
doesn't.是,他必须做./不,他不必做.
三、haveto
的特殊疑问句形式
1、
What
do
you
have
to
do
on
Sundays?在星期天你得干什么?
2、
Why
does
she
have
to
move
to
Paris?她为什么得迁往巴黎?
3、
Where
do
they
have
to
work?他们必须在哪里工作?
四、haveto
可用于各种时态
A、一般现在时：I
have
to
visit
Mr
Wang
tomorrow.
明天我得去拜访王先生.
B、一般过去时：That
night
we
had
to
walk
home
because
there
was
no
bus.
那天晚上我们不得不步行回家,因为没有公共汽车.
C、一般将来时：We'll
have
to
ask
Zhang
Ming
instead.
我们得请张明代替.
D、与may
连用：I
think
he
may
have
to
help
his
Dad
in
the
garden.
我想他可能得在花园里帮他爸爸干活.
五、have
to
与
must
的用法区别
A、
have
to
比较强调客观需要,而
must
着重说明主观看法.
1、
My
mother
is
ill.I
have
to
look
after
her
at
home.
妈妈病了,我得在家照看她.
2、
You
must
finish
your
homework
first.
你必须先完成作业.
B、
have
to
有时态和人称变化,而
must
则没有.
1、
Mary
has
to
water
the
trees.
玛莉得浇树.
2、
He
must
bring
a
picnic
tomorrow.
他明天得带野餐.
C、must
有“推测”之意,而
have
to
则没有.
He
must
be
in
the
classroom.
他一定在教室里.