When John and Mary went to the shops, John gave the bag to
When John and Mary went to the shops, Mary gave the bag to
When Tom and James went to the park, James gave the ball to
When Tom and James went to the park, Tom gave the ball to
When Dan and Sid went to the shops, Sid gave an apple to
When Dan and Sid went to the shops, Dan gave an apple to
After Martin and Amy went to the park, Amy gave a drink to
After Martin and Amy went to the park, Martin gave a drink to

 Mary, John; John, Mary; Tom, James; James, Tom; Dan, Sid; Sid, Dan; Martin, Amy; Amy, Martin;