Question

it is a waste of time doing还是to do

为什么？
How long is it from the library to his home?
还是How long it is from the library to his home?

Answer 1

是

It is a waste of time to do something.

因为这是动词不定式的复合结构。 

It's adj. for sb to do sth for sb to do sth是真正的主语，sb是to do sth的逻辑主语的。

如： It is impossible for him to get up early. It's important (for me) to carry on practicing speaking for learning English. 

动词不定式的复合结构是“for / of sb. to do sth.”。

扩展资料

不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。

一般说来,of前面的形容词是careful, clever, foolish, good, kind, nice, wise等,说明人的特性。

for前面的形容词是dangerous, difficult, easy, hard, heavy, important, interesting, necessary等,一般说明不定式动作的特性.

前面如果是名词用for。如:

1.It’s a good idea for parents to allow children to study in groups during the evening.

对父母来说,在晚上让孩子分组学习是个好主意。

2.It’s wise of him to do it well.

对他来说,把这件事做好很明智。

Answer 2

1.都可以。
It is a waste of time后面可以加doing（动名词）或者to do（to不可以省略）。

例句：
It is a waste of time waiting any longer.
It is a waste of time to argue with him.

2.How far is it from the library to his home?
(距离用far，long一般是问时间的长短）

Answer 3

doing
it is a waste of time doing 是“浪费时间做某事”的意思，固定搭配

How long is it from the library to his home? 是对的

Answer 4

是
It
is
a
waste
of
time
to
do
something.
因为这是动词不定式的复合结构。
It's
adj.
for
sb
to
do
sth
for
sb
to
do
sth是真正的主语，sb是to
do
sth的逻辑主语的。
如：
It
is
impossible
for
him
to
get
up
early.
It's
important
(for
me)
to
carry
on
practicing
speaking
for
learning
English.
动词不定式的复合结构是“for
/
of
sb.
to
do
sth.”。
扩展资料
不定式复合结构的介词用for还是of,主要决定于前面形容词的性质。
一般说来,of前面的形容词是careful,
clever,
foolish,
good,
kind,
nice,
wise等,说明人的特性。
for前面的形容词是dangerous,
difficult,
easy,
hard,
heavy,
important,
interesting,
necessary等,一般说明不定式动作的特性.
前面如果是名词用for。如:
1.It’s
a
good
idea
for
parents
to
allow
children
to
study
in
groups
during
the
evening.
对父母来说,在晚上让孩子分组学习是个好主意。
2.It’s
wise
of
him
to
do
it
well.
对他来说,把这件事做好很明智。

Answer 5

传统的用法为
It's
a
waste
of
time
doing
sth
It
is
a
waste
of
time
going
to
the
doctor
with
most
mild
complaints.
一点小毛病就去看医生是浪费时间。
来自柯林斯例句
2.
It
is
a
waste
of
time
warning
him
—
he
is
determined
to
go
his
own
way.
警告他等于浪费时间,因为他决心要照自己的意思去做.
来自《简明英汉词典》
但现在在非正式的英语中也有to
do
的
It
is
a
waste
of
time
to
read
such
a
magazine.
看这种杂志真是浪费时间.
来自互联网
5.
It
is
a
waste
of
time
to
try
to
rehabilitate
some
criminals.
改造有些犯罪分子是浪费时间.
来自互联网