Original sentence:
When we turned the corner, I found the magic wand on a pile of garbage.
Look at the following sentences and find what has changed. What is the effect of the change:
1. When we turned the corner, I found the magic wand on a pill of garbage.
2. When we turned the corner I found the magic wand on a pile of garbage.
3. When we turn the corner, I found the magic wand on a pile of garbage.