Is this a proper sentence? An invention is the creation of something that never existed before.

Is this a proper sentence? The custodian swept the hall floor after the kids came in from recess.

Is this a proper sentence? Pollen causes people with hay fever to sneeze they should stay inside during spring.

Is this a proper sentence? An invention differs from a discovery, but they are closely related.

Is this a proper sentence? John opened the garage door for his father he was trying to be helpful.

Is this a proper sentence? Men are not ruined by what they want they are ruined by what they think they want.

Is this a proper sentence? After eight hours of sleep you should look refreshed.

Is this a proper sentence? The little boy dreamed about the day he could become a fireman just like his dad.

Is this a proper sentence? The purple lilacs are fragrant and beautiful.

Is this a proper sentence? Most bears hibernate during the cold winter months so you don't have to worry about seeing them during a winter walk.

Is this a proper sentence? Bob studied diligently for his math test and he passed.

Is this a proper sentence? Honesty is always the best policy.