we should do we can do to help forests.什么句式?为什么can 后面加的是to d

这句话是个宾语从句~we should do something（what we can do to help forests）.我们应该做点什么的意思.要做的事情是指保护丛林,something就指的是保护森林.
你给出的句子省略了what~而句子中断句应该是we should do what we can do to help forests.最后的to do是指目的.