In English, sentences have a subject (who or what the sentence is about) and a verb (the action). The relationship between the subject and the verb determines the sentence's "voice."

The most common structure is the active voice. Here, the subject performs the action. It's direct and clear. The structure usually follows a simple pattern: Subject + Verb + Object.

In this example, the dog (the subject) is doing the action (chewing). The shoe (the object) is receiving the action.

Now, let's look at the passive voice. In the passive voice, the subject receives the action instead of doing it. The focus shifts from the doer of the action to the recipient.

The structure for a passive sentence looks a bit different. It typically uses a form of the verb "to be" (like is, was, were, has been) followed by the past participle of the main verb.

Notice how the shoe is now the subject of the sentence, but it isn't doing anything. It's receiving the action. The doer of the action, the dog, is mentioned at the end after the word "by."

The key to telling active and passive sentences apart is to find the subject and see if it's performing the verb's action.

• Active: The subject does the action.
• Passive: The subject receives the action.

One of the easiest ways to spot the passive voice is to look for a form of the verb "to be" followed by a past participle (like was eaten, is built, were seen).

Most of the time, active voice is preferred because it's more direct and uses fewer words. However, the passive voice is useful when the person or thing doing the action is unknown or unimportant.

For example, if your wallet was stolen but you don't know who did it, you would say, "My wallet was stolen." The focus is on the wallet and the action, not the unknown thief.

Understanding this difference is a key step in building clearer and more effective sentences.