Is this a proper sentence? We play chess when it rains.

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

Is this a proper sentence? Our basketball team won the game for the district championship.

Is this a proper sentence? My little sister Gretchen is growing like a weed soon she will be taller than me.

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

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

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

Is this a proper sentence? Birds are hidden from their enemies they blend into their surroundings.

Is this a proper sentence? Mr. Dunn assigned three exercises for homework during the second week of school.

Is this a proper sentence? Thomas Edison was perhaps the greatest inventor in history his first invention was a vote recorder.

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.

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? An invention differs from a discovery, but they are closely related.