非谓语动词（不定式） to do & to have done

精讲课笔记随视频锁定

右侧笔记支持独立滚动。边听名师连读拆解，边对照右侧的语法事实与统计数据笔记。

to do ^{表将(要)来}	to have done ^{结何完成时强调发生在过去}
当“名词使用”、表“目的”修饰名词、句子子
Fishermen claim to see monsters... ^{声称要去看怪物(还没去)}	Sailors claim to have seen monsters in the sea. ^{1、之前已看到。2、做宾语(当名词用)}
It is my pleasure to help you. ^{将要去帮你}	It is my pleasure to have helped you. ^之前帮过