把下列句子改成过去时态1 I enjoy listening to rock music 2 He likes playing volleyball.3 Her father's friend is a doctor.4 Lucy can swim very well.5 I think he is an interesting waiter.6 It is time for Bob to go to bed.7 Mike reads a book about science every week.

一般过去时态：表示过去某一时间所发生的动作或存在的状态.谓语动词要用一般过去式.经常与yesterday（昨天）,last week（上周）,last month（上个月）,last year（去年）,two months ago（两个月前）,the day before yesterday（前天）,in 1990 (在1990年),in those days （在那些日子里）等表示过去的时间状语连用.
如：I was born in 1990.(我出生在1990年).
When did you go to the park?（你是什么时候去的公园）.
I went to the park last week.（我是上周去的公园）
在上面的句子中第一句属于be动词的一般过去时态；第二句和第三句属于实义动词的一般过去时态.
1． Be 动词的一般过去时态
在没有实义动词的句子中使用be动词,am is 的过去式为was; are的过去式为were.
构成：肯定句：主语+was (were) +宾语
如：I was late yesterday.（昨天我迟到了.）
否定句：主语+was (were) +not+宾语
如：We weren't late yesterday.(我们昨天没迟到)
疑问句：Was (Were) +主语+宾语
如：Were you ill yesterday?（你昨天病了吗?）
肯定回答：Yes,I was.(是的,我病了.)
否定句：No,I wasn't.(不,我没病.)
特殊疑问句：特殊疑问词+was (were) +主语+宾语
如：When were you born?你是什么时候出生的?