Question

i have a lot of homework to do today作业为什么用原型

我们常说：I have a lot of homework to do today.那下面这两个句子：
I have a lot of problems to solve.
I have a lot of problems to be solved.哪个是正确的?为什么?

Answer 1

两个句子都正确,都是用不定式作定语修饰 problems .但所表示的意思不一样.
I have a lot of problems to solve.
不定式用主动式,说明主语发出不定式的动作.
句意:我有许多问题需要解决.(我自己解决问题)
I have a lot of problems to be solved.
不定式用被动式,说明主语不是不定式的动作的发出者.
但对宾语problems来说,却是被动关系(问题被解决),因此不定式用被动式.
句意:我有许多问题需要解决(指需要别人来解决问题).