有一读者问：有下面一个错句：
(1)When I came in the house, I found him busy to draw a painting .
划线的错误部分应改成 drawing a painting, 还是应改成 to be drawing a painting?
find sb.busy （或be busy）之后不可用不定式，应用动名词（其前省去了介词 in）,故此句应将 to draw a painting 改为 drawing a painting。实际上，形容词 busy 之后一般皆不可接不定式，而常可接省去 in 的动名词（也有语法家称之为现在分词或笼统称之为-ing形式），如：
(2)She was busy preparing the meal.
(3)His assistant was busy putting the instruments away.
(4)Farmers are busy working in the fields.
但下面一句中的too busy 则自然可后接不定式：
(5)He was too busy to eat .
