The purpose of an adjective clause is using a subject and verb that provide a description of the sentence. Impact allow the reader to understand what is occurring and why it is occurring. Who cause the affects? Or where is it happening?
The past tense and particle is hurt.
This is because you can't go back into time and "hurt" someone. Its the same for "read". When you read the sentence, you see that it makes sense.
I.E: I read the book on Tuesdays
I read the book on Tuesdays
I hope this helps you.