It is of english

Dear Student.

2) If he hadn't gone down the steps, he would have been alright. 
3) If he had worn his seat belt, he would have sustained fewer injuries. 
4) If he had read the instructions, he would have used the appliance safely. 
5) He wouldn't have fallen down if he didn't jump over the fence.  
6) He would have been stopped if somebody looked at what he was doing.
7) He wouldn't have broken his leg if he hadn't stood on the chair. 

We hope that this answer solves your query.
Regards.