the sweater is too expensive to buy.为什么不加it. 关于及物动词和不及物动词有点晕晕的
那为什么The sweater is so expensive that I can't afford to buy it.这里要加IT
追答呵呵,这是因为这个事有一个状语从句啊,从句也好,主句也罢,一定要有主语、谓语、宾语。而前面的那句话只有一个句子啊!
明白了吧,同学?
再如:The shoes are too small to wear.
The shoes are so small that I can't wear them.
祝你好运!