用到了一个词组：find sb doing something,其实和see somebody doing差不多
They found the boy playing with a cat.
也可以用that 从句：They found that the boy was playing with a cat.
用到了一个词组：find sb doing something,其实和see somebody doing差不多
They found the boy playing with a cat.
也可以用that 从句：They found that the boy was playing with a cat.