关于英语情态动词would rather have done need not have done各表示什么意义?请造句

Would rather have done：你最好去做某事,可是你没做 表虚拟,有点悔恨没做那件事
例句：you would rather have seen this movie. 你本来应该去看这部电影（可你没去）
need not have done 你本来没必要做 可是你做了 跟上句意思相反
例句：you neednot have come here so early.你没必要来那么早 （可是你已经来这么早了）