答案是：spend
和pay在做花费讲时
，气主语都是表示人的名词或者代词，词组是：spend
some
time
/money
in
doing
sth
pay
some
money
for
sth
/pay
sb
somenthing
而
cost
的主语通常是物，take的
主语是形式主语it，构成词组
it
takes
sb
some
time
to
do
sth
,比如：
I
spent
half
an
hour
in
finishing
my
homework
it
took
me
half
an
hour
to
finish
the
homework
I
paid
ten
daollars
for
the
dictionary
the
dictionary
cost
me
ten
dollars
enough
既可以做形容词
，修饰名词，可以放在名词前或者是名词后，当用做副词修饰形容词或者副词是，放在被修饰词之后
比如：
I
don't
have
enough
money
to
buy
the
car
the
boy
isn't
old
enough
to
go
to
school
~手工翻译，尊重劳动，欢迎提问，感谢采纳！~
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