1. A few minutes later, the dog started to have a stomachache and we had to take him to the hospital.
2. A few minutes later, the dog started to groan lying on the floor, so we had to take him to the hospital.
3. A few minutes later, the dog began to make a strange sound sitting on the floor, and we had to take him to the hospital.
4. A few minutes later, the dog groaned and felt painful,so we had to take him to the hospital.
(Would you check the sentences and correct some errors? Thank you.)
1 and 4 are correct as they are. Don't forget the space after the second comma in #4.
2 and 3 need some slight rephrasing. As they are, 2 reads as if the groan were lying on the floor! 3 reads as if the dog's strange sound were sitting on the floor!! Here's how to fix 2 and 3:
2. A few minutes later, the dog was lying on the floor and started to groan, so we had to take him to the hospital.
3. A few minutes later, the dog was sitting on the floor and began to make a strange sound, so we had to take him to the hospital.
1. A few minutes later, the dog started to have a stomachache, so we had to take him to the hospital.
2. Your sentence is grammatically correct, but you could improve the clarity by rephrasing it as: A few minutes later, the dog started groaning and lying on the floor, so we had to take him to the hospital.
3. Your sentence is grammatically correct, but you could improve the clarity by rephrasing it as: A few minutes later, the dog began making a strange sound while sitting on the floor, and we had to take him to the hospital.
4. Your sentence is grammatically correct. However, you could improve the clarity by rephrasing it as: A few minutes later, the dog started groaning and experiencing pain, so we had to take him to the hospital.
Overall, all the sentences convey the same idea, but some minor improvements can be made to enhance clarity and sentence structure.