请各位帮忙做几个改错的题（关于介词的
问题描述：
请各位帮忙做几个改错的题（关于介词的
1.You should buy a good bike if you buy for all.
2.The teacher was angry at us for having disobeyed his orders.
3.A businessman is a man who works on business.
注意；都是介词有错误的~
答
第一个 我不知道!
第二个 The teacher was angry at us for having disobeyed his orders.在这里是一个固定的词组!be angry to do sth 意思是对某事生气!这里用了介词 for 应该是 to 后面+动词不定式!
第三个 A businessman is a man who works on business.一个从事商业工作的男商人!这里指从事哪种工作,应该用for!