Here's why:
* Passive voice can be wordy and unclear. It often requires more words to express the same idea in the active voice. For example, "The ball was thrown by the boy" is less concise and impactful than "The boy threw the ball."
* Passive voice can be ambiguous. It can be unclear who or what is performing the action. For example, "The report was submitted" doesn't tell us who submitted it.
* Passive voice can weaken your writing. It can make your writing sound less confident and less engaging.
However, there are some situations where the passive voice is appropriate:
* When the actor is unknown or unimportant. For example, "The window was broken."
* When you want to emphasize the object of the action. For example, "The patient was treated by a skilled doctor."
* When you want to avoid assigning blame. For example, "Mistakes were made."
In general, strive to use the active voice whenever possible. It will make your writing clearer, more concise, and more engaging.