There are four oranges on the table.(改为一般过去式)

1. There were four oranges on the table

2. I didn’t see one boy on the street。此句有点问题。我认为应该是这样：I didn’t any boys on the street

3. We had great fun in the zoo/We enjoyed ourselves very much in the zoo/We had a wonderful time in the zoo   。。。。and so on

4. Where did your father work two years ago？  注意。work 是动词应用助动词 do does 等修饰           

   最后望楼主采纳   祝你学习进步

1
There were four oranges on the table.

2
I did not see one boy on the street.
3
We were enjoyful in the zoo.
4
Where were my(your) father worked two years ago?

1、There were four oranges on the table.
2、I didn't see one boy on the street.

3、We enjoyed ourselves in the zoo.
4、Where did your father work two years ago？