I have been thinking about to purchase it for a long time.这句话有语病么
问题描述：
I have been thinking about to purchase it for a long time.这句话有语病么
答
把to去掉,purchase改为purchasing,about本身是介词,后面可直接加动名词to purchase 和purchasing 不是说都可以么。。。think about后面是不能用to do 的形式的，只能用doing