1. The dog followed mary, for a half a mile. It stayed very close behind her, so she forced herself to stay calm.

2. Folllowing mary was the dog that stayed behind her for a half a mile. and was very close to her but she was calm.

3. There was a dog chasing mary and it was very close to her but she only styed calm.

4. This dog was chasing mary around the block, but she knew that she had to be calm before the dog bit her.