We use stop punctuation to show the end of a complete thought. The most common form of stop punctuation is the period. Here are some examples of a period at the end of a sentence:
Today is Monday.
Mom took us to visit the zoo.
Before you open the door, be sure to keep Woofy from running away.
Place a period at the end of each sentence to show that the thought is complete.
It’s your turn. Place a period at the end of this complete thought: I am learning about grammar It wasn’t too difficult, was it?