spend的主语必须是人，
常用于以下结构：(1)
spend
time
／money
on
sth.
在……上花费时间（金钱）。例：I
spent
two
hours
on
this
maths
problem.
这道数学题花了我两个小时。(2)
spend
time
／
money
(in)
doing
sth.
花费时间（金钱）做某事。例：They
spent
two
years
(in)
building
this
bridge.
造这座桥花了他们两年时间。(3)spend
money
for
sth.
花钱买……。例：His
money
was
spent
for
books.
他的钱用来买书了。
cost的主语是物或某种活动，
还可以表示“值”，
常见用法如下：(1)sth.
costs
(sb.)
＋金钱,某物花了（某人）多少钱。例：A
new
computer
costs
a
lot
of
money.
买一台新电脑要花一大笔钱。(2)
(doing)
sth.
costs
(sb.)
＋时间,某物（做某事）花了（某人）多少时间。例：Remembering
these
new
words
cost
him
a
lot
of
time.
他花了大量时间才记住了这些单词。
注意：cost的过去式及过去分词都是cost,并且不能用于被动句。
take后面常跟双宾语，
常见用法有以下几种：(1)
It
takes
sb.
＋时间＋to
do
sth.
做某事花了某人多少时间。例：It
took
them
three
years
to
build
this
road.
他们用了三年时间修完了这条路。(2)doing
sth.
takes
sb.
＋时间,做某事花了某人多少时间。例：Repairing
this
car
took
him
the
whole
afternoon.
他花了一下午修车。
pay的基本用法是：(1)
pay
(sb.)
money
for
sth.
付钱（给某人）买……。例：I
have
to
pay
them
20
pounds
for
this
room
each
month.
我每个月要付20英磅的房租。(2)pay
for
sth.
付……的钱。例：I
have
to
pay
for
the
book
lost.
我不得不赔丢失的书款。(3)pay
for
sb.
替某人付钱。例：Don?蒺t
worry!I\'ll
pay
for
you.
别担心，
我会给你付钱的。(4)pay
sb.
付钱给某人。
例:
They
pay
us
every
month.他们每月给我们报酬。（5）pay
money
back
还钱。例：May
I
borrow
12
yuan
from
you?
I\'ll
pay
it
back
next
week.
你能借给我12块钱吗？下周还你。（6）pay
off
one\'s
money还清钱。
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