The rule as a picture, 5 multiple-choice questions, 3 sentences to correct and a short writing task. Free to print and copy for your class or for self-study.
Want the explanation first? Read the The Passive With By lesson
Add by + the doer only when it's useful or new information: This book was written by my grandmother. If the doer is unknown, obvious or unimportant, leave it out: The window was broken. Use with for a tool: It was opened with a knife.
This book was written by my grandmother.
Write three sentences of your own that use this rule. You can use these phrases.
Answers will vary. Check that each sentence follows the rule on page 1, or paste them into Clarigram to have them checked.