Is this a proper sentence? After eight hours of sleep you should look refreshed.
No you need a comma after sleep.
Is this a proper sentence? My little brother Greg is growing like a weed soon he will be taller than me.
No, you need a comma after weed.
Is this a proper sentence? Birds are hidden from their enemies they blend into their surroundings.
No
Yes
Is this a proper sentence? The purple lilacs are fragrant and beautiful.
Yes
No
Is this a proper sentence? A penny is a very small amount but the comfort of many families depends upon the proper saving and spending of pennies.
No, there should be a comma before but.
Is this a proper sentence? Pollen causes people with hay fever to sneeze they should stay inside during spring.
Yes
No
Is this a proper sentence? Adam looked distressed as he saw the work piled before him.
No
Yes
Is this a proper sentence? An invention differs from a discovery, but they are closely related.
No
Yes
Is this a proper sentence? It takes courage to obey difficult instructions the wise man will obey for his own good.
No
Yes
Is this a proper sentence? The homesick girl ran to meet her parents, she was so glad they were finally home.
No
Yes
Is this a proper sentence? An invention is the creation of something that never existed before.
No
Yes
Is this a proper sentence? This has been a wonderful year of new experiences will next year be as good?
No
Yes
Is this a proper sentence? The little boy dreamed about the day he become a fireman just like his dad.
No, you need a comma after fireman.
Is this a proper sentence? Bob studied diligently for his math test and he passed.
Yes
No
Is this a proper sentence? We play chess when it rains.
Yes
No
Is this a proper sentence? Mr. Dunn assigned three exercises for homework during the second week of school.
Yes
No
Is this a proper sentence? Men are not ruined by what they want they are ruined by what they think they want.
No
Yes
Is this a proper sentence? John opened the garage door for his father he was trying to be helpful.
Yes
No
Is this a proper sentence? The Venus flytrap often grows to a height of one foot.
No
Yes
Is this a proper sentence? Thomas Edison was perhaps the greatest inventor in history his first invention was a vote recorder.
No
Yes
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.
No, you need a comma after months.
Is this a proper sentence? Honesty is always the best policy.
Yes
No
Is this a proper sentence? Our basketball team won the game for the district championship.
No
Yes
Is this a proper sentence? The custodian swept the hall floor after the kids came in from recess.
No
Yes