英语的几题对下划线部分提问的问题怎么做

1When did you visit an old friend of yours?
2What did you do yesterday morning?
3Who did you visit yesterday morning?
4Whose old friend did you visit yesterday morning?

很简单的:
Yesterday morning ---When did you go to visit the old friend of yours?
这里:
an old friend 要改为:the old friend，当然了，如果不改也可以。
mine 要改为:物主格yours ,此处用 you 其实我觉得也不错.
went to visit ...

原文有几处拼写错误,现修改如下:
Yesterday morning I went to visit an oid friend of mine .
1When did you visit an old friend of yours?
2What did you do yesterday morning?
3Who did you visit yesterday morning?
4Whose old friend did you visit yesterday morning?