1. If there was a ban on cigarette, less people would smoke cigarette.

->If there were a ban on cigarette, less people would smoke cigarette.

2. If the tax rate on junk food had increased, people would likely to prefer making food at home.

->If the tax rate on junk food had increased, people would likely to prefer making food at home.

3. If schools administered with any teachers, disorder would arise.

->If schools were notadministered with by any teachers, disorder would arise.

4. If uncensored commercials had been banned, the crime rate would be seized from rising.

-> If uncensored commercials had been banned, the crime rate would behave been seized from rising.

5. If computers replaced teachers in the classroom, learning would have been less effective.

-> If computers replaced teachers in the classroom, learning would have be less effective.