What is an imperative sentence?

An imperative sentence gives a command. It usually ends with a period, but it may also end with an exclamation point (!). Commands ask or tell people to do something.

All of those sentences can be categorized as commands.

Notice, though, that some of them don't sound as commanding as others. "Command" in this sense can also encompass requests, warnings, and invitations. These sentences just need to ask or tell someone to do something.

Subjects are nouns or pronouns that tell us whom or what a sentences is about. Here are some example sentences for you to check out. I've underlined the subjects for you.

Dog and Jimmy are the subjects of those sentences. They tell us whom or what the sentences are about.

Now, take a look at some imperative sentences.

What are the subjects of those sentences? Hmm... that's tricky!

This may sound strange, but every single command has the same subject! Yikes! How is that even possible?

Well, since commands are always speaking to someone or something (you've got to address them if you're going to ask them to do something), the subject is always the word you.

You may have noticed that the word "you" is not even in a command. Because of this, the subject is actually called you understood, and it is written like this: (you)

This means that the subject is the word you, but since you is not written or spoken in the sentence, it is simply understood and is written in parentheses.

When a command begins with a noun of direct address, you might get tricked into thinking that it is a declarative sentence. 

Bob, shut the door!

Grandma, be there at 5:00.

But, don't get tricked! These sentences are still commands and their subjects are still (you). Learn more about nouns of direct address beginning commands here. 

Sentence diagrams show us how the words work in our sentences. We diagram the subject on the left and the verb on the right.

Here are some example diagrams for you! You can see that (you) is the subject of these sentences.

Shut the door.

Be there at 5:00.

Have fun and learn more about diagramming with these exercises and these video lessons.