do的过去式是did,是用于一般过去时的助动词,过去分词为done。它的意思是做;干;学习;研究。
例句:
1、He did not belong to his set of friends.他与他那伙朋友不一样。
2、The journalist did not want to reveal the identity of his informant.那个新闻工作者不想透露消息提供人的身分。
3、What he did went beyond the bounds of law.他的所作所为已超出了法律允许的范围。