1.the computer is too expensive for me to buy ( ).空里要不要加it

1.不要!
此句的主语是后面不定式的逻辑宾语
其句型是：
【主语+is(was)+ 形容词+ to 动词原形】
如：
The question is easy to answer.
The maths problem is difficult to work out.
He is easy to get along with.
2.比如：
He isn't old enough to go to scholl.
=He is too young to go to school
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