afford能后接to do，通常不接doing。
1.afford to do sth.表示有足够的钱能够做某事
He can't afford to buy such an expensive car.
他负担不起买如此昂贵的汽车。
She can afford to buy new coats.
她负担得起买新外套。
2.afford to do sth. 表示承受得起做某事
We can afford to wait for another two hours.
再等两个小时，我们能承受得起。
所以通常是afford to do不是doing。
